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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en">The Occurrence of Skeletons of Silicoflagellata and Other Siliceous Bioparticles in Floral Honeys</title><author><name sortKey="Magyar, Donat" sort="Magyar, Donat" uniqKey="Magyar D" first="Donát" last="Magyar">Donát Magyar</name><affiliation><nlm:aff id="af1-foods-10-00421">National Public Health Center, 1097 Budapest, Hungary</nlm:aff></affiliation></author><author><name sortKey="Dumitrica, Paulian" sort="Dumitrica, Paulian" uniqKey="Dumitrica P" first="Paulian" last="Dumitrica">Paulian Dumitrica</name><affiliation><nlm:aff id="af2-foods-10-00421">Institute of Earth Sciences, Université de Lausanne, 1015 Lausanne, Switzerland;<email>Paulian.Dumitrica@unil.ch</email></nlm:aff></affiliation></author><author><name sortKey="Mura Meszaros, Anna" sort="Mura Meszaros, Anna" uniqKey="Mura Meszaros A" first="Anna" last="Mura-Mészáros">Anna Mura-Mészáros</name><affiliation><nlm:aff id="af3-foods-10-00421">Faculty of Biological Sciences, Friedrich Schiller University Jena, 07743 Jena, Germany;<email>muram.anna@gmail.com</email></nlm:aff></affiliation></author><author><name sortKey="Medzihradszky, Zs Fia" sort="Medzihradszky, Zs Fia" uniqKey="Medzihradszky Z" first="Zs Fia" last="Medzihradszky">Zs Fia Medzihradszky</name><affiliation><nlm:aff id="af4-foods-10-00421">Museum and Library of Hungarian Agriculture, 1146 Budapest, Hungary;<email>medzihradszky.zsofia@mmgm.hu</email></nlm:aff></affiliation></author><author><name sortKey="Leel Ssy, Adam" sort="Leel Ssy, Adam" uniqKey="Leel Ssy A" first="Ádám" last="Leel Ssy">Ádám Leel Ssy</name><affiliation><nlm:aff id="af5-foods-10-00421">Department of Meteorology, Eötvös Loránd University, 1053 Budapest, Hungary;<email>leelossyadam@gmail.com</email></nlm:aff></affiliation></author><author><name sortKey="Saint Martin, Simona" sort="Saint Martin, Simona" uniqKey="Saint Martin S" first="Simona" last="Saint Martin">Simona Saint Martin</name><affiliation><nlm:aff id="af6-foods-10-00421">Centre de Recherche en Paléontologie, Muséum National d’Histoire Naturelle, Sorbonne Université, 75006 Paris, France;<email>simona.saint-martin@mnhn.fr</email></nlm:aff></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">PMC</idno><idno type="pmid">33672957</idno><idno type="pmc">7918607</idno><idno type="url">http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7918607</idno><idno type="RBID">PMC:7918607</idno><idno type="doi">10.3390/foods10020421</idno><date when="2021">2021</date><idno type="wicri:Area/Pmc/Corpus">000182</idno><idno type="wicri:explorRef" wicri:stream="Pmc" wicri:step="Corpus" wicri:corpus="PMC">000182</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">The Occurrence of Skeletons of Silicoflagellata and Other Siliceous Bioparticles in Floral Honeys</title><author><name sortKey="Magyar, Donat" sort="Magyar, Donat" uniqKey="Magyar D" first="Donát" last="Magyar">Donát Magyar</name><affiliation><nlm:aff id="af1-foods-10-00421">National Public Health Center, 1097 Budapest, Hungary</nlm:aff></affiliation></author><author><name sortKey="Dumitrica, Paulian" sort="Dumitrica, Paulian" uniqKey="Dumitrica P" first="Paulian" last="Dumitrica">Paulian Dumitrica</name><affiliation><nlm:aff id="af2-foods-10-00421">Institute of Earth Sciences, Université de Lausanne, 1015 Lausanne, Switzerland;<email>Paulian.Dumitrica@unil.ch</email></nlm:aff></affiliation></author><author><name sortKey="Mura Meszaros, Anna" sort="Mura Meszaros, Anna" uniqKey="Mura Meszaros A" first="Anna" last="Mura-Mészáros">Anna Mura-Mészáros</name><affiliation><nlm:aff id="af3-foods-10-00421">Faculty of Biological Sciences, Friedrich Schiller University Jena, 07743 Jena, Germany;<email>muram.anna@gmail.com</email></nlm:aff></affiliation></author><author><name sortKey="Medzihradszky, Zs Fia" sort="Medzihradszky, Zs Fia" uniqKey="Medzihradszky Z" first="Zs Fia" last="Medzihradszky">Zs Fia Medzihradszky</name><affiliation><nlm:aff id="af4-foods-10-00421">Museum and Library of Hungarian Agriculture, 1146 Budapest, Hungary;<email>medzihradszky.zsofia@mmgm.hu</email></nlm:aff></affiliation></author><author><name sortKey="Leel Ssy, Adam" sort="Leel Ssy, Adam" uniqKey="Leel Ssy A" first="Ádám" last="Leel Ssy">Ádám Leel Ssy</name><affiliation><nlm:aff id="af5-foods-10-00421">Department of Meteorology, Eötvös Loránd University, 1053 Budapest, Hungary;<email>leelossyadam@gmail.com</email></nlm:aff></affiliation></author><author><name sortKey="Saint Martin, Simona" sort="Saint Martin, Simona" uniqKey="Saint Martin S" first="Simona" last="Saint Martin">Simona Saint Martin</name><affiliation><nlm:aff id="af6-foods-10-00421">Centre de Recherche en Paléontologie, Muséum National d’Histoire Naturelle, Sorbonne Université, 75006 Paris, France;<email>simona.saint-martin@mnhn.fr</email></nlm:aff></affiliation></author></analytic><series><title level="j">Foods</title><idno type="eISSN">2304-8158</idno><imprint><date when="2021">2021</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en"><p>Siliceous marine microfossils were unexpectedly discovered during the analysis of flower honey samples from Poland and Tunisia. The microfossils were represented by protist with siliceous skeletons: silicoflagellates, diatoms, and endoskeletal dinoflagellates. This is the first record of such microfossils in honeys. Based on the high percent of anemophilous pollen grains and spores in the sample, it was hypothesized that silicoflagellates were deposited from the air onto the nectariferous flowers, then bees harvested them with the nectar. Based on the comparison of pollen content of honeys and flowering calendar of Tunisia, the harvest time of honey was identified as a period between 1 April and 31 May 2011. Trajectory analysis of air masses in this period confirmed that siliceous microfossils could be aerosolized by wind from the rocks of the so-called Tripoli Formation of Messinian age (6–7 Ma). Similar to the Tunisian case, the Polish trajectory simulation also supports the hypothesis of atmospheric transport of silicoflagellates from outcrops of Oligocene age in the Polish Outer Carpathians. In the case of diatom content of honey, however, the source can be both natural (wind) and artificial (diatomaceous earth filters). For a correct determination, natural sources of siliceous bioparticles, such as wind transport from nearby outcrops should be also considered. Silicoflagellates could be used as complementary indicators of the geographical origin of honeys collected in areas characterized by diatomite outcrops, supporting the results obtained with other methods; thus, such indicators merit further studies within the area of honey authenticity.</p></div></front><back><div1 type="bibliography"><listBibl><biblStruct><analytic><author><name sortKey="Soares, S" uniqKey="Soares S">S. Soares</name></author><author><name sortKey="Amaral, J S" uniqKey="Amaral J">J.S. Amaral</name></author><author><name sortKey="Oliveira, M B P" uniqKey="Oliveira M">M.B.P. Oliveira</name></author><author><name sortKey="Mafra, I" uniqKey="Mafra I">I. 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<front><journal-meta><journal-id journal-id-type="nlm-ta">Foods</journal-id><journal-id journal-id-type="iso-abbrev">Foods</journal-id><journal-id journal-id-type="publisher-id">foods</journal-id><journal-title-group><journal-title>Foods</journal-title></journal-title-group><issn pub-type="epub">2304-8158</issn><publisher><publisher-name>MDPI</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="pmid">33672957</article-id><article-id pub-id-type="pmc">7918607</article-id><article-id pub-id-type="doi">10.3390/foods10020421</article-id><article-id pub-id-type="publisher-id">foods-10-00421</article-id><article-categories><subj-group subj-group-type="heading"><subject>Article</subject></subj-group></article-categories><title-group><article-title>The Occurrence of Skeletons of Silicoflagellata and Other Siliceous Bioparticles in Floral Honeys</article-title></title-group><contrib-group><contrib contrib-type="author"><name><surname>Magyar</surname><given-names>Donát</given-names></name><xref ref-type="aff" rid="af1-foods-10-00421">1</xref><xref rid="c1-foods-10-00421" ref-type="corresp">*</xref></contrib><contrib contrib-type="author"><name><surname>Dumitrica</surname><given-names>Paulian</given-names></name><xref ref-type="aff" rid="af2-foods-10-00421">2</xref></contrib><contrib contrib-type="author"><name><surname>Mura-Mészáros</surname><given-names>Anna</given-names></name><xref ref-type="aff" rid="af3-foods-10-00421">3</xref></contrib><contrib contrib-type="author"><name><surname>Medzihradszky</surname><given-names>Zsófia</given-names></name><xref ref-type="aff" rid="af4-foods-10-00421">4</xref></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid" authenticated="true">https://orcid.org/0000-0001-9583-0127</contrib-id><name><surname>Leelőssy</surname><given-names>Ádám</given-names></name><xref ref-type="aff" rid="af5-foods-10-00421">5</xref></contrib><contrib contrib-type="author"><name><surname>Saint Martin</surname><given-names>Simona</given-names></name><xref ref-type="aff" rid="af6-foods-10-00421">6</xref></contrib></contrib-group><contrib-group><contrib contrib-type="editor"><name><surname>Kafarski</surname><given-names>Paweł</given-names></name><role>Academic Editor</role></contrib><contrib contrib-type="editor"><name><surname>Escuredo</surname><given-names>Olga</given-names></name><role>Academic Editor</role></contrib><contrib contrib-type="editor"><name><surname>Seijo</surname><given-names>M. Carmen</given-names></name><role>Academic Editor</role></contrib></contrib-group><aff id="af1-foods-10-00421"><label>1</label>National Public Health Center, 1097 Budapest, Hungary</aff><aff id="af2-foods-10-00421"><label>2</label>Institute of Earth Sciences, Université de Lausanne, 1015 Lausanne, Switzerland;<email>Paulian.Dumitrica@unil.ch</email></aff><aff id="af3-foods-10-00421"><label>3</label>Faculty of Biological Sciences, Friedrich Schiller University Jena, 07743 Jena, Germany;<email>muram.anna@gmail.com</email></aff><aff id="af4-foods-10-00421"><label>4</label>Museum and Library of Hungarian Agriculture, 1146 Budapest, Hungary;<email>medzihradszky.zsofia@mmgm.hu</email></aff><aff id="af5-foods-10-00421"><label>5</label>Department of Meteorology, Eötvös Loránd University, 1053 Budapest, Hungary;<email>leelossyadam@gmail.com</email></aff><aff id="af6-foods-10-00421"><label>6</label>Centre de Recherche en Paléontologie, Muséum National d’Histoire Naturelle, Sorbonne Université, 75006 Paris, France;<email>simona.saint-martin@mnhn.fr</email></aff><author-notes><corresp id="c1-foods-10-00421"><label>*</label>Correspondence: <email>magyar.donat@gmail.com</email></corresp></author-notes><pub-date pub-type="epub"><day>14</day><month>2</month><year>2021</year></pub-date><pub-date pub-type="collection"><month>2</month><year>2021</year></pub-date><volume>10</volume><issue>2</issue><elocation-id>421</elocation-id><history><date date-type="received"><day>23</day><month>12</month><year>2020</year></date><date date-type="accepted"><day>09</day><month>2</month><year>2021</year></date></history><permissions><copyright-statement>© 2021 by the authors.</copyright-statement><copyright-year>2021</copyright-year><license license-type="open-access"><license-p>Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (<ext-link ext-link-type="uri" xlink:href="http://creativecommons.org/licenses/by/4.0/">http://creativecommons.org/licenses/by/4.0/</ext-link>).</license-p></license></permissions><abstract><p>Siliceous marine microfossils were unexpectedly discovered during the analysis of flower honey samples from Poland and Tunisia. The microfossils were represented by protist with siliceous skeletons: silicoflagellates, diatoms, and endoskeletal dinoflagellates. This is the first record of such microfossils in honeys. Based on the high percent of anemophilous pollen grains and spores in the sample, it was hypothesized that silicoflagellates were deposited from the air onto the nectariferous flowers, then bees harvested them with the nectar. Based on the comparison of pollen content of honeys and flowering calendar of Tunisia, the harvest time of honey was identified as a period between 1 April and 31 May 2011. Trajectory analysis of air masses in this period confirmed that siliceous microfossils could be aerosolized by wind from the rocks of the so-called Tripoli Formation of Messinian age (6–7 Ma). Similar to the Tunisian case, the Polish trajectory simulation also supports the hypothesis of atmospheric transport of silicoflagellates from outcrops of Oligocene age in the Polish Outer Carpathians. In the case of diatom content of honey, however, the source can be both natural (wind) and artificial (diatomaceous earth filters). For a correct determination, natural sources of siliceous bioparticles, such as wind transport from nearby outcrops should be also considered. Silicoflagellates could be used as complementary indicators of the geographical origin of honeys collected in areas characterized by diatomite outcrops, supporting the results obtained with other methods; thus, such indicators merit further studies within the area of honey authenticity.</p></abstract><kwd-group><kwd>honey</kwd><kwd>Silicoflagellata</kwd><kwd>diatoms</kwd><kwd>pollen</kwd><kwd>spores</kwd></kwd-group></article-meta></front><body><sec sec-type="intro" id="sec1-foods-10-00421"><title>1. Introduction</title><p>The identification of the origin of food is one of the most important issues in food quality control [<xref rid="B1-foods-10-00421" ref-type="bibr">1</xref>]. Depending on its geographical origin (the region where the beehives are located and the surrounding environment), honey can acquire different characteristics and properties. Therefore, geographical origin is an important parameter with respect to honey differentiation and valorization.</p><p>The determination of the geographical origin of honey relies on microscopical examination of its pollen profile if it is specific enough in the area of interest. Because of the limitations of this method (being expensive, time-consuming, and strongly dependent on the qualifications and judgement of the analyst), there is a tendency to replace pollen analysis by finding other markers for honey discrimination. Minerals and trace elements [<xref rid="B1-foods-10-00421" ref-type="bibr">1</xref>], and fungal spore content [<xref rid="B2-foods-10-00421" ref-type="bibr">2</xref>] are some of the parameters that have been examined for the recognition of the origin of honeys. However, when microscopical analysis of honeys is performed, one can see a great variety of particles, other than pollen grains or spores. Some of them belong to insect parts, most commonly bee hair, tracheae and, especially in <italic>Pinus</italic> honeydew honeys, wax produced by Pseudococcidae. Surprisingly, some particles come from microfauna as well (Acari, Rotifera, eggs of Tardigrade). Plant trichomes, starch, and phytoliths are also common components of honey samples. As a sign of human activity, microplastics can also be observed in honey under the microscope. These particles are often overlooked during the routine melissopalyonolgical analysis of samples. As no attention is paid to them, they remain unidentified, although they would be useful in the analysis.</p><p>During our research to find new indicators of the origin of the honeys, unusual multiradiate structures were found in honey samples that originated from Poland and Tunisia. Therefore, we aimed to identify these particles and other accompanying components in honey to find any indication of their origin.</p></sec><sec id="sec2-foods-10-00421"><title>2. Materials and Methods</title><p>The honeys were purchased from food shops in Poland (according to the information on the product label, the honey was harvested from <italic>Fagopyrum esculentum</italic> in Stróze, near Nowy Sącz, 2013) and Tunisia (mixed floral honey, Nabeul, 2011). Ten grams were taken from 250 g of previously homogenized honey, dissolved in 20 mL of distilled water at 40 °C, centrifuged for 5 min at 2500 rpm, and allowed to settle. The sediment was recovered in 10 mL of distilled water and again centrifuged. The sediment was then collected with a Pasteur pipette and dried onto microscope slides at 40 °C. It was then mounted in glycerine-gelatine and covered [<xref rid="B3-foods-10-00421" ref-type="bibr">3</xref>,<xref rid="B4-foods-10-00421" ref-type="bibr">4</xref>]. The entire surface of the preparation was scanned under 600× magnification of an Olympus CX 31 microscope. Preliminary identification indicated that multiradiate particles may belong to extinct microscopic organisms, occurring as fossils.</p><p>To see the frequency of occurrence of these particles, we studied samples from a collection containing 106 honeys, prepared according to the method mentioned above. These samples were listed in the <xref ref-type="app" rid="app1-foods-10-00421">Supplement 1</xref> with their collection code, type, botanical origin, and location.</p><p>Because the Polish (P) and the Tunisian (T) honeys were particularly rich in the investigated multiradiate particles, further analyses were performed. To identify the geographical origin of the multiradiate particles, a combination of methods was applied. First, fungal spore and pollen composition were determined.</p><p>Among fungal spores, honeydew indicators were not found [<xref rid="B2-foods-10-00421" ref-type="bibr">2</xref>], but indicators of floral origin (<italic>Metschnikowia reukaufii,</italic> P,T) and common airborne fungi were present (<italic>Alternaria</italic> sp. P,T, <italic>Aspergillus/Penicillium</italic> P,T, <italic>Bipolaris spicifera</italic> T, <italic>Botrytis</italic> sp. P, <italic>Chaetomium</italic> sp. P,T, <italic>Cladosporium</italic> spp. P,T, <italic>Coprinus</italic> sp. P,T, <italic>Curvularia</italic> sp. T, <italic>Diplodia frumenti</italic> T, <italic>Drechslera biseptata</italic> T, <italic>Drechslera/Helminthosporium</italic> T, <italic>Ellisembia</italic> sp. T, <italic>Epicoccum nigrum</italic> P,T, <italic>Ganoderma</italic> sp. P, <italic>Leptosphaeria</italic> spp. P, <italic>Melampsoridium</italic> sp. T, <italic>Paraphaeosphaeria michotii</italic> P, <italic>Periconia</italic> sp. T, Peronosporaceae P, <italic>Pithomyces chartarum</italic> T, <italic>Polythrincium trifolii</italic> P, Pucciniaceae T, <italic>Rhizopus</italic> sp. T, <italic>Stemphylium</italic> sp. P,T, Telephoraceae P, <italic>Torula</italic> sp. P,T, <italic>Trichothecium roseum</italic> P, <italic>Tripospermum</italic> spp.P, Ustilaginomycetes P,T, other Ascomycota). Pollen content was expressed as percentage of pollen grains (N = 300) [<xref rid="B5-foods-10-00421" ref-type="bibr">5</xref>]: P: <italic>Brassica</italic> 34%, <italic>Centaurea cyanus</italic> 5%, <italic>Fagopyrum</italic> 5%, <italic>Trifolium</italic> 2%, Ericaceae and <italic>Tilia</italic> < 2%; T (in descending order of frequency; data are shown on <xref ref-type="fig" rid="foods-10-00421-f001">Figure 1</xref>): Poaceae spp., Brassicaceae (<italic>Brassica</italic> cf. <italic>napus</italic>), <italic>Eucalyptus</italic> sp., <italic>Myrtus</italic> sp., <italic>Acacia</italic> sp., Ericaceae sp., <italic>Carex</italic> sp., Caryophyllaceae, Chenopodiaceae, Compositae-Tubuliflorae, <italic>Trifolium</italic> sp., Umbelliferae, <italic>Vicia</italic> sp., <italic>Zea mays</italic>, Boraginaceae, Compositae-Liguliflorae, <italic>Convolvulus</italic> sp., <italic>Echium</italic> sp., Labiatae, Polygalaceae sp., <italic>Rumex</italic> sp. [<xref rid="B6-foods-10-00421" ref-type="bibr">6</xref>,<xref rid="B7-foods-10-00421" ref-type="bibr">7</xref>]. Percentage of pollen grains also showed that dominant taxa are anemophylic.</p><p>Consequently, we hypothesized that multiradiate particles found in the honey samples might also have airborne origin. To test this hypothesis, we searched for the possible source of multiradiate particles. The source of airborne particles can be identified with the calculation of wind trajectory of air masses carrying particles from long distances. An important information for calculations is the time (year and month) of honey harvest. However, in case of the Polish honey, only the year (2013) was known. Harvesting period was determined to be July–August according to the blooming of <italic>Fagopyrum esculentum</italic> [<xref rid="B11-foods-10-00421" ref-type="bibr">11</xref>]. In the case of Tunisian honey, the year 2011 was shown on the product’s label. The month of acquisition was known as well (31 July). Therefore, the month of harvest had to be identified. With this aim, a forensic palynological method was used [<xref rid="B12-foods-10-00421" ref-type="bibr">12</xref>,<xref rid="B13-foods-10-00421" ref-type="bibr">13</xref>]. To collect information on pollination of local melliferous plants, phenological calendars were reviewed [<xref rid="B9-foods-10-00421" ref-type="bibr">9</xref>]. Because the dominant pollen taxa in the honey belonged to anemophilous plants, data from aerobiological literature were also considered [<xref rid="B8-foods-10-00421" ref-type="bibr">8</xref>] (data from the year of 2011) [<xref rid="B10-foods-10-00421" ref-type="bibr">10</xref>]. Number of pollen taxa found in the honey was summarized by month and illustrated on a histogram (<xref ref-type="fig" rid="foods-10-00421-f001">Figure 1</xref>). According to this analysis, the honey was most probably harvested during the months of April and May.</p><p>To investigate whether atmospheric conditions supported the transport of aerosol particles from the suspected source area to the harvesting region, an atmospheric dispersion model was applied for the flowering periods (P: July–August 2013, T: April–May 2011). The dust emission flux was estimated to be a cubic function of the friction velocity, according to the dust emission model presented by Bagnold [<xref rid="B14-foods-10-00421" ref-type="bibr">14</xref>], discussed more recently by Xuan [<xref rid="B15-foods-10-00421" ref-type="bibr">15</xref>], and applied as described in a previous study [<xref rid="B16-foods-10-00421" ref-type="bibr">16</xref>]. The threshold friction velocity was set to 0.5 ms<sup>−1</sup>, a medium value within the range of experimental results of Marticorena and Bergametti [<xref rid="B17-foods-10-00421" ref-type="bibr">17</xref>]. If the friction velocity was higher than the threshold friction velocity and no precipitation occurred, 1000 particles were released in every hour from each of 20 levels between 1–1000 m above ground; and their atmospheric trajectories were simulated for 48 h. Meteorological data was obtained from the GDAS FNL (Global Data Assimilation System—Final Analysis) database [<xref rid="B18-foods-10-00421" ref-type="bibr">18</xref>] with 3 h temporal and 0.25° spatial resolution. Atmospheric dispersion was simulated with the Lagrangian particle dispersion model RAPTOR that calculates advection, turbulent dispersion, and deposition [<xref rid="B19-foods-10-00421" ref-type="bibr">19</xref>,<xref rid="B20-foods-10-00421" ref-type="bibr">20</xref>]. As the extent and amount of mobilizable dust is unknown, sensitivity maps were produced with unit m<sup>−3</sup>, normalized to a total sensitivity of 1 over the entire domain. This way, the spatial and temporal pattern of the dispersion could be investigated while the amount of deflated dust remains unknown.</p></sec><sec sec-type="results" id="sec3-foods-10-00421"><title>3. Results and Discussion</title><p>Our investigations have shown that honey from Tunisia (T), Morocco (M), Africa (A), Greece (G) Poland (P), and Romania (R) contained silica skeletons of planktonic marine Silicoflagellata belonging to <italic>Dictyocha fibula</italic> (T), <italic>Distephanopsis crux</italic> (T), <italic>Stephanocha speculum</italic> (A,G,P,R), <italic>Stephanocha</italic> cf. <italic>speculum</italic> (M), <italic>Stephanocha speculum speculum</italic> (T), <italic>Stephanocha speculum speculum</italic> f. <italic>notabilis</italic> (T) (<xref ref-type="fig" rid="foods-10-00421-f002">Figure 2</xref>, <xref rid="foods-10-00421-t001" ref-type="table">Table 1</xref>). Diatoms, e.g., <italic>Actinocyclus divisus</italic>, <italic>Coscinodiscus marginatus</italic>, <italic>Coscinodiscus</italic> (?) sp., <italic>Fragilaria</italic> (?) sp., <italic>Hantzschia amphioxys</italic>, <italic>Mastogloia</italic> (?) sp., <italic>Melosira</italic> sp., <italic>Nitzschia</italic> (?) sp., <italic>Thalassionema nitzschioides</italic>, and very rare endoskeletal siliceous dinoflagellates belonging to <italic>Actiniscus pentasterias</italic> were also found (<xref ref-type="fig" rid="foods-10-00421-f003">Figure 3</xref>, <xref rid="foods-10-00421-t001" ref-type="table">Table 1</xref>). To our knowledge, this is the first record in the literature of silicoflagellates and other protists with siliceous skeletons occurring in honey.</p><p>Silicoflagellates are planktonic marine chloroplast-bearing protists with a flagellum and a siliceous skeleton formed of distally closed hollow bars known to have existed starting from the mid-Cretaceous (Albian) to recent. Their skeletons usually comprise 1–2% of the siliceous component of marine sediments [<xref rid="B21-foods-10-00421" ref-type="bibr">21</xref>] and in some cases, as for example in some Sarmatian deposits from Romania, they are so abundant that practically these rocks could be called silicoflagellitites. Their skeleton has a rather simple geometrical form and consists usually of two parts: a basal ring and an apical structure, both interconnected by bars. All these elements have a special descriptive nomenclature [<xref rid="B21-foods-10-00421" ref-type="bibr">21</xref>,<xref rid="B22-foods-10-00421" ref-type="bibr">22</xref>]. <italic>Dictyocha fibula</italic> is a species characteristic of warm water, whereas <italic>Stephanocha speculum</italic> is much more frequent in colder waters. <italic>Distephanopsis crux</italic> is a Miocene and Pliocene species that became extinct at the base of the Pleistocene [<xref rid="B23-foods-10-00421" ref-type="bibr">23</xref>]. All these three species are common in the diatomites of the so-called Tripoli Formation of Messinian age that can be visible in outcrops and found also in cored sediments [<xref rid="B24-foods-10-00421" ref-type="bibr">24</xref>,<xref rid="B25-foods-10-00421" ref-type="bibr">25</xref>,<xref rid="B26-foods-10-00421" ref-type="bibr">26</xref>,<xref rid="B27-foods-10-00421" ref-type="bibr">27</xref>] in the Mediterranean area. They were deposited 6–7 million years ago before the period of the closing of the Mediterranean Sea, which determined the famous “Messinian Salinity Crisis” that lasted until the Pliocene [<xref rid="B28-foods-10-00421" ref-type="bibr">28</xref>]. These diatomites are well known especially in Spain, Italy, Crete, Cyprus, and in the northwestern part of Africa, in Morocco and Algeria. The only mining of Messinian diatomites, formerly active in the Oran region in Algeria [<xref rid="B29-foods-10-00421" ref-type="bibr">29</xref>], has long been abandoned.</p><p>The diatomites are porous rocks of marine or lacustrine origin. The marine diatomites originated in zones of high planktonic fertility. The lacustrine diatomites were especially formed in lakes of volcanic craters or in zones with volcanic tufs. Although they are very light due to the porosity of diatom frustules, they may contain up to 3000 frustules/mm<sup>3</sup> [<xref rid="B30-foods-10-00421" ref-type="bibr">30</xref>]. Therefore, we hypothesized that these marine siliceous microfossils found in honey are of airborne origin. They may have been deposited as airborne dust on the flowers from where the bees collected them with the nectar. The presence of other particles (pollen grains, fungal spores, dinoflagellates, and diatoms) corroborate this hypothesis.</p><p>Diatoms can become airborne from outcrops (e.g., by mining activity), by deflation from dried lakebeds, or after swamp fires and storms [<xref rid="B31-foods-10-00421" ref-type="bibr">31</xref>] or via sea-foam and bursting bubbles [<xref rid="B32-foods-10-00421" ref-type="bibr">32</xref>]. Geissler and Gerloff [<xref rid="B33-foods-10-00421" ref-type="bibr">33</xref>] showed that the species composition of airborne diatoms above the city of Berlin is identical to the composition of diatoms in Berlin lakes and rivers. Folger [<xref rid="B34-foods-10-00421" ref-type="bibr">34</xref>] as well as many others, found <italic>Melosira granulata</italic> and <italic>Stephanodiscus astrea</italic> to be the most common diatoms in airborne dust samples from the Equatorial Atlantic. <italic>Cyclotella</italic> and <italic>Stephanodiscus</italic> spp. were found in high quantities as house dust in a building constructed on a dried lakebed in Hungary (Magyar, unpublished observation). Specimens of <italic>Corethron</italic>, another marine diatom, were recently detected in Late Cretaceous amber [<xref rid="B35-foods-10-00421" ref-type="bibr">35</xref>]; the authors considered that the amber forest grew in a nearshore environment where wind introduced the marine diatoms into the terrestrial realm. The occurrence of airborne algae in the atmosphere has been recorded as early as the middle of the 19th century. In 1833, aboard the famous vessel Beagle, Charles Darwin observed airborne diatoms in the dust from North Africa deposited on the board when it was near Cape Verde Islands [<xref rid="B36-foods-10-00421" ref-type="bibr">36</xref>]. Ehrenberg [<xref rid="B37-foods-10-00421" ref-type="bibr">37</xref>] reported 18 species of freshwater diatoms from the dust samples sent by Darwin. Since then, North African dust particles associated with diatoms were frequently observed [<xref rid="B38-foods-10-00421" ref-type="bibr">38</xref>]. Diatoms from the Bodélé Depression (once part of Mega-Lake Chad, North Africa) are the main source material for the dust [<xref rid="B39-foods-10-00421" ref-type="bibr">39</xref>]. Direct sampling of the atmosphere in various environments (e.g., terrestrial, marine, and freshwater) provided evidence that airborne algae are naturally occurring in the aerial biota [<xref rid="B40-foods-10-00421" ref-type="bibr">40</xref>]. In the Tunisian honey we investigated, recent diatoms were present. <italic>Mastogloia</italic> sp. and <italic>Thalassionema nitzschioides</italic> contained chloroplasts, thus they could be recent, originating from sea spray or high tide and wind.</p><p><italic>Actiniscus pentasterias</italic> is a Miocene to recent species of endoskeletal dinoflagellates. Its star-like specimens with five, rarely four arms are frequent in marine sediments with other siliceous microfossils [<xref rid="B41-foods-10-00421" ref-type="bibr">41</xref>]. Its stellate arched structure, although rather small, is very easily recognized in microscope slides. Each spicule represents one of the two spicules present in a living cell and disposed symmetrically face to face with their concave sides opposed in the ovoid cell. Usually, they are separated in fossil material, but interconnected specimens by the end of the rays can be encountered when the sample is not treated too much with hydrochloric or other acids that can dissolve the points of interconnection. Rather neglected in the fossil samples, it was studied in detail by Dumitrica [<xref rid="B41-foods-10-00421" ref-type="bibr">41</xref>] who described several species and tried to make an order in this group.</p><p>There are no diatomites and therefore no mining of diatomites in Tunisia. However, the closest Messinian diatomites are those of Sicily about 250 km to 300 km from Nabeul (the location of honey harvest) to the northeast [<xref rid="B26-foods-10-00421" ref-type="bibr">26</xref>,<xref rid="B27-foods-10-00421" ref-type="bibr">27</xref>].</p><p>Atmospheric dispersion simulations performed in the period April–May 2011 revealed a situation when atmospheric conditions supported the transport of dust from Sicily to the region of Nabeul. Dust emission was assumed only when the threshold friction velocities exceeded 0.5 ms<sup>−1</sup> and no precipitation occurred. Among these, 21–22 May was characterized by northerly-northeasterly winds in Sicily, brought by a Mediterranean cyclone marking the end of an 18-day long drought. Dry surface conditions with approaching thunderstorms were ideal for gust fronts and evaporative cooling, a well-known pattern for deflation [<xref rid="B42-foods-10-00421" ref-type="bibr">42</xref>]. According to WMO synop reports from the hilltop meteorological station of Enna (20 km to the northeast and 350 m above Caltanissetta) on the night of 21–22 May 2011, repeated thunderstorms with or without precipitation occurred, although yielding a total precipitation of only 3 mm/12 h. This confirms the potential for evaporative cooling and the formation of gust fronts. Thunder with no rain and the 1-h mean wind velocity reaching 30 km/h was reported at 3 UTC. Continuous rain inhibiting further deflation initiated at approximately 6 UTC; however, the total precipitation remained relatively low during the day (12 mm/24 h). Atmospheric dispersion maps of particles released from Caltanissetta between 18–6 UTC on 21–22 May 2011 (<xref ref-type="fig" rid="foods-10-00421-f004">Figure 4</xref>) confirm the potential of the deflated dust to reach Tunisia. In the flow of the cyclone, the dust would have travelled in a moist environment to North Africa and deposited efficiently with rain onto the surface.</p><p>It might also be noted that in the previous week (10–18 May 2011), a documented Saharan dust event had occurred in Portugal [<xref rid="B43-foods-10-00421" ref-type="bibr">43</xref>], related to the ongoing shallow cyclonic activity over the Mediterranean. While dust transport typically occurs northward on the leading edge of cyclones, similar dust transport potential is present on the rear edge of a cyclone towards North Africa.</p><p>Therefore, trajectory simulations support the hypothesis of atmospheric transport of silicoflagellates from Sicily to Nabeul.</p><p><italic>Stephanocha speculum</italic> was found in a Polish product labelled as <italic>Fagopyrum</italic> honey. Since this silicoflagellata occurs from the Miocene to Recent, one can suppose that it comes from the diatomite intercalated in the Middle Miocene from the Silezian Basin [<xref rid="B44-foods-10-00421" ref-type="bibr">44</xref>]. Outcrops of Oligocene age diatomites in the Carpathians are exposed on the surface (<xref ref-type="fig" rid="foods-10-00421-f005">Figure 5</xref>); thus, particles as small as silicoflagellate skeletons can be lifted from outcropping on the surface of soft sediments and transported by winds, being a plausible source of silicoflagellates to explain our observations. It is possible that the source of these silicoflagellata is a diatomite in eastern part of the Polish Outer Carpathians, 60 km from the honey harvesting area [<xref rid="B45-foods-10-00421" ref-type="bibr">45</xref>]. A simulation study was performed with the atmospheric dispersion model for the harvesting period July–August 2013, i.e., the blooming of <italic>F. esculentum</italic> [<xref rid="B11-foods-10-00421" ref-type="bibr">11</xref>]. The source area was represented by the location 49.8 N and 22.6 E and sensitivity maps were produced for each day to investigate whether the atmospheric conditions were suitable to deflate particles and transport them to the harvesting location near Stróze, Poland. It was found that in the beginning and the end of the harvesting period, e.g., on 4 July and 26 August, atmospheric conditions supported the potential transport of microfossils to the honey harvesting area (<xref ref-type="fig" rid="foods-10-00421-f006">Figure 6</xref>). Meteorological observations reported from Nowy Sącz, located in a distance of 20 km from Stróze, confirmed that between 10–19 UTC on 4 July and 9–16 UTC on 26 August 2013, easterly-northeasterly winds dominated the area, potentially transporting microfossils from the upwind direction. No precipitation but trace had been reported for the previous four days. Similar to the Tunisian case, the Polish trajectory simulation also supports the hypothesis of atmospheric transport of silicoflagellates from outcrops of Oligocene age (possibly quarries).</p><p>The dominance of the Poaceae pollen in the Tunisian honey sample corroborates our hypothesis that the particles were deposited from the atmosphere. Poaceae produce typical anemophilous pollen grains, and their presence in honey is rare and incidental in North African honeys [<xref rid="B46-foods-10-00421" ref-type="bibr">46</xref>]. Fungal spores were also the common members of the airspora.</p><p>Surprisingly, we did not find any scientific report on the presence of silicoflagellata in air samples, possibly because aerobiological networks focus on the monitoring of pathogenic bioaerosols, e.g., allergenic pollen grains and spores, rather than other particles [<xref rid="B47-foods-10-00421" ref-type="bibr">47</xref>]. Further studies are needed to study the presence of silicoflagellates and diatoms in air samples and honeys harvested within the area of diatomite outcrops.</p><p>In our honey collection, a total of 21 countries are represented by samples, 14 of them from Europe (most of them were from Italy, Greece and Hungary). Silicoflagellates were observed in three of our European honey samples (<italic>Pinus</italic> honeydew honey from Greece; <italic>Fagopyrum esculentum</italic> honey from Poland, Stróze; and honeydew honey from Romania, Odorheiu Secuiesc). No silicoflagellates were found in eight other <italic>Pinus</italic> honeydew honey samples collected from Greece, and four <italic>Fagopyrum esculentum</italic> samples collected from Poland, Stróze or nearby (Królów, Lipowy and Wiśniowa). Other two samples (<italic>Robinia pseudo-acacia</italic> honey and a honeydew honey) collected from Stróze or nearby (Pogorzany) were analysed, but again, with negative results.</p><p>In case of North African honeys, samples from Egypt, Morocco, and Tunisia were available for analysis. Silicoflagellates were found in the honeys originating from the latter two countries. For Morocco, there is a possible source from Messinian diatomite outcrops known in Boudinar and Melilla basins and for Tunisia the closest possible source may be the Messinian diatomites outcrops in Sicily [<xref rid="B48-foods-10-00421" ref-type="bibr">48</xref>,<xref rid="B49-foods-10-00421" ref-type="bibr">49</xref>]. Another positive sample was found from Africa, but more precise information on the origin of the honey is not available. Because data on the composition of the North-African honeys are uncommon [<xref rid="B9-foods-10-00421" ref-type="bibr">9</xref>], information on new indicators of geographical origin of honeys in this region is useful. According to our findings, the occurrence of silicoflagellates may be expected in honey harvested near diatomites in Algeria, Crete, Hungary, Poland, Romania, Sicily, and Spain. We propose further studies on the presence of microfossils in honeys of other areas of the world as well.</p><p>The identification of the origin of food is one of the most important issues in food quality control [<xref rid="B1-foods-10-00421" ref-type="bibr">1</xref>,<xref rid="B50-foods-10-00421" ref-type="bibr">50</xref>]. Considering the increasing global trade and owing to the higher economic value of specific honeys (e. g. those having protected geographical indication), such products are targets of adulteration through incorrect labelling and fraudulent admixing with honey of lower value and quality. Thus, in order to promote fair competition among producers, and protect consumers, there is a growing need to assess the authenticity of honey, particularly with regard to geographical origins [<xref rid="B1-foods-10-00421" ref-type="bibr">1</xref>]. Microfossil identification could be compared with other microscopy-based analytical methods, such as melissopalynology. These methods allow a good differentiation of honeys, however, are not suitable for application in the case of filtered honeys. Melissopalynology has a limitation in its application in honey adulterated by pollen addition [<xref rid="B1-foods-10-00421" ref-type="bibr">1</xref>]. Silicoflagellates can be used as non-quantitative indicators, as the mere presence of their distinct siliceous skeletons can indicate the geographical source of honeys. Because no particle counting is needed, the analysis is less time-consuming than quantitative microscopical methods. (Similar, non-quantitative indicators of honey origin were previously proposed on the basis of biodiversity of fungal spores [<xref rid="B2-foods-10-00421" ref-type="bibr">2</xref>].) Our findings encourage the confirmation of honey origin also by recording the occurrence of microfossil elements during routine melissopalynological analysis. Silicoflagellata skeletons are characteristic multiradiate particles and it is easy to observe them in honey samples, thus they seem to be good candidates of indicators of geographical origin of honeys in food analysis. The most frequent species was <italic>Stephanocha speculum</italic> (1 particle/g honey), followed by <italic>Dictyocha fibula</italic> and <italic>Distephanopsis crux</italic> (both having 0.3/g; data from the Tunisian sample). Only <italic>Stephanocha speculum</italic> was found in the other honey samples from Africa and Europe. The limitation of our method is the low frequency of microfossils in honeys. Observation of the presence of silicoflagellates can be used in a complementary way. Because of their low frequency in honey, only positive findings can be interpreted as indicators of geographical origin. Apparently, silicoflagellates in honeys are not common, but if detected, can provide a strong evidence of geographical origin of the honey.</p><p>Marine species of diatoms (<italic>Coscinodiscus marginatus</italic>, <italic>Actinocyclus divisus</italic> and <italic>Thalassionema nitzschioides</italic>) have a large geological range and are also known in actual assemblages. They are known in Messinian diatomites in the Mediterreanean area, but since they have a very large geological time span distribution, they cannot be considered as markers for Messinian [<xref rid="B26-foods-10-00421" ref-type="bibr">26</xref>,<xref rid="B48-foods-10-00421" ref-type="bibr">48</xref>]. Thus, silicoflagellates only support a possible Messinian age. Consequently, diatoms cannot be used as indicators of the honey origin. It should be mentioned that fossil diatoms can have another source in the honeys: diatomite earth filters. The use of diatomite earth filters is largely known in food industry. The presence of fossil diatoms was already observed in honey, and is explained by the use of diatomite filters in order to: (a) filtration to obtain pure honey [<xref rid="B1-foods-10-00421" ref-type="bibr">1</xref>] (b) forge [<xref rid="B51-foods-10-00421" ref-type="bibr">51</xref>,<xref rid="B52-foods-10-00421" ref-type="bibr">52</xref>]. Forgers combine two kinds of honey: a local honey with another kind of honey that is much cheaper. Diatomaceous earth filter aids completely remove the pollen, and thus prevent any identification of source by analysis of pollen. In our samples, three categories of diatoms were found: fossil marine diatoms, freshwater diatoms, and living freshwater pennate diatoms.</p><p>1. Fossil marine diatoms (ex. <italic>Coscinodiscus marginatus</italic>, <italic>Actinocyclus divissus</italic>) together with fossil silicoflagellates. Their occurrence can be explained:</p><p>(a) By wind transport from fossil diatomite (e.g., Tripoli formation);</p><p>(b) Contamination from filters made from diatomite earth. Diatomite used for the fabrication of filters may be made from marine diatomites that contain marine diatom genera like <italic>Coscinodiscus</italic> and <italic>Actinocyclus</italic>.</p><p>2. Freshwater centric diatoms (e.g., <italic>Aulacoseira distans</italic>, <italic>Cyclotella</italic>), known from Miocene, Pliocene up to day in freshwater and lacustrine assemblages. Their occurrence might be explained:</p><p>(a) By wind transport from fossil diatomite from strata of fossil freshwater diatoms.</p><p>(b) Contamination from filters made from diatomite earth. For example, in France, there is known exploitation of fossil lacustrine diatomite Miocene in age from Massif Central that might be used for the fabrication of filters [<xref rid="B53-foods-10-00421" ref-type="bibr">53</xref>]. This lacustrine diatomite contains <italic>Aulacoseira distans</italic> and <italic>Cyclotella</italic>. Recovery of <italic>Aulacoseira</italic> sp. was reported from only pressed honey sample in Nigeria, Africa, and interpreted as an indication of secondary contamination during processing [<xref rid="B46-foods-10-00421" ref-type="bibr">46</xref>].</p><p>3. Living freshwater pennate diatoms that present the chloroplasts and cellular content, together with living cyanobacteria (<italic>Chroococcus</italic> and <italic>Oscillatoria</italic>) and green algae (<italic>Scenedesmus</italic>). Obviously, living diatoms do not originate from diatomite earth filters. Their occurrence might be explained:</p><p>(a) By wind transport. <italic>Nitzschia</italic> and <italic>Chroococcus</italic> were common living diatom and cyanobacteria in our samples (especially in Cuba, France, Greece, Hungary and Italy). These genera were reported to be airborne [<xref rid="B54-foods-10-00421" ref-type="bibr">54</xref>,<xref rid="B55-foods-10-00421" ref-type="bibr">55</xref>].</p><p>(b) The presence of green microalgae (e.g., <italic>Scenedesmus</italic>) is characteristic of honeydew honeys as well [<xref rid="B56-foods-10-00421" ref-type="bibr">56</xref>]. When honey bees collect honeydew, they may also collect other attached structures such as algae that grow on plants. In our samples, such algae were not associated with silicoflagellata, but were found in honeys of honeydew origin.</p><p>(c) Freshwater, as a source cannot be excluded either. Adding water to honey is a known authentication technique to increase the volume. Food analytical tests, such as microscopic yeast count and analysis of fermentation products are available to indirectly detect this type of honey adulteration [<xref rid="B1-foods-10-00421" ref-type="bibr">1</xref>].</p><p>Each of the above-mentioned hypotheses can be considered as true alone, but they are not exclusive (i.e., diatoms and silicoflagelates transported by wind and living diatoms were added using freshwater).</p><p>In case of the Tunisian honey, matching evidences (wind trajectory analysis and high percentage of anemophilous pollen and spores) indicate that the source of siliceous bioparticles is possibly not the result of filtration, but air. In the unknown African honey, a high percentage of anemophilous pollen (Chenopodiaceae) was found too, leading to similar hypothesis. The Polish product was labelled as <italic>Fagopyrum</italic> honey. Our pollen analysis confirmed the presence of this pollen. Here, again both trajectory analysis and pollen composition suggested natural sources of particles in the honey. In the Romanian honey, fungal indicators (<italic>Metschnikowia</italic>, <italic>Retiarius</italic> and <italic>Tripospermum</italic>) suggested that the origin is mixed floral and honeydew honey, but of natural (i.e non-forged) source [<xref rid="B2-foods-10-00421" ref-type="bibr">2</xref>]. Similar evidences are available in the honey sample from Altenst, Germany, where conidia of a honeydew-indicator hypomycete (<italic>Retiarius</italic>) were found with the freshwater diatom <italic>Aulacoseira distans</italic>. Consequently, the presence of siliceous bioparticles in honey does not necessarily indicate the manipulation of the product. For correct determination, natural sources of siliceous bioparticles, such as wind transport from nearby outcrops, should also be considered. According to a world map showing main directions of atmospheric transport of diatoms, presented by Harper and McKay [<xref rid="B57-foods-10-00421" ref-type="bibr">57</xref>], the occurrence of windborne microfossils in honeys might be a world-wide phenomenon.</p></sec><sec sec-type="conclusions" id="sec4-foods-10-00421"><title>4. Conclusions</title><p>Silica skeletons of planktonic marine silicoflagellates were found in honey samples from Greece, Morocco, Poland, Romania, and Tunisia. In Tunisia, the source of silicoflagellate content of honey is suspected to be the wind erosion of microfossils from the Tripoli Formation of Messinian age in nearby Sicily. In Poland, the source is similarly shown in the Polish Outer Carpathians, but with low diversity of silicoflagellata species. Atmospheric trajectory analysis confirmed the possibility of atmospheric transport of deflated grains in the harvesting period. Therefore, silicoflagellates could be used as indicators of the geographical origin of honeys collected in areas characterized by diatomite outcrops. It was demonstrated that the diatom content of honey can have both natural (wind) and artificial (filters) sources.</p></sec></body><back><ack><title>Acknowledgments</title><p>The authors are thankful to Szilvia Babinszkyné Nagy (Hungarian Institute for Forensic Sciences, Budapest, Hungary) for gifting the Tunisian honey and for the translation of French and Arabic texts; Francesca Grillenzoni (Consiglio per la Ricerca in Agricoltura e l’Analisi dell’Economia Agraria, Centro di Ricerca Agricoltura e Ambiente, Italy) for gifting several honey samples; Magdalena Wójcik (University of Rzeszów, Poland) for gifting a honey sample from Poland; Jakub Alexandrowicz (Geology and Palaeogeography Unit, Faculty of Geosciences University of Szczecin, Poland) for the consultation on diatomites in Poland; and Ágnes Schütz and Zsuzsanna Udvardi (National Public Health Center, Budapest, Hungary) for their kind technical help in the laboratory.</p></ack><fn-group><fn><p><bold>Publisher’s Note:</bold> MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations.</p></fn></fn-group><app-group><app id="app1-foods-10-00421"><title>Supplementary Materials</title><p>The following are available online at <uri xlink:href="https://www.mdpi.com/2304-8158/10/2/421/s1">https://www.mdpi.com/2304-8158/10/2/421/s1</uri>, Supplement 1: The studied honey samples. Data are organized by collection code, botanical origin, type and location.</p><supplementary-material content-type="local-data" id="foods-10-00421-s001"><media xlink:href="foods-10-00421-s001.pdf"><caption><p>Click here for additional data file.</p></caption></media></supplementary-material></app></app-group><notes><title>Author Contributions</title><p>Conceptualization, observation of silicoflagellates, research concept, supervision, writing—original draft preparation, photos, spore identification: D.M.; identification of silicoflagellates and writing: P.D.; laboratory works, writing—review and editing: A.M.-M.; identification of pollen grains: Z.M.; trajectory analysis, funding acquisition: Á.L.; identification of diatoms, conceptualization and writing: S.S.M. All authors have read and agreed to the published version of the manuscript.</p></notes><notes><title>Funding</title><p>The atmospheric transport analysis presented in this research was supported by the National Research, Development and Innovation Office of Hungary (No. K128818).</p></notes><notes><title>Institutional Review Board Statement</title><p>Not applicable.</p></notes><notes><title>Informed Consent Statement</title><p>Not applicable.</p></notes><notes notes-type="data-availability"><title>Data Availability Statement</title><p>Data is contained within the article or supplementary material.</p></notes><notes notes-type="COI-statement"><title>Conflicts of Interest</title><p>The authors declare no conflict of interest.</p></notes><ref-list><title>References</title><ref id="B1-foods-10-00421"><label>1.</label><element-citation publication-type="journal"><person-group person-group-type="author"><name><surname>Soares</surname><given-names>S.</given-names></name><name><surname>Amaral</surname><given-names>J.S.</given-names></name><name><surname>Oliveira</surname><given-names>M.B.P.</given-names></name><name><surname>Mafra</surname><given-names>I.</given-names></name></person-group><article-title>A comprehensive review on the main honey authentication issues: Production and origin</article-title><source>Compr. 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Dark shades mean flowering peaks, according to the original illustrations. <sup>c</sup>: Flowering time from phenological data [<xref rid="B9-foods-10-00421" ref-type="bibr">9</xref>] shown in yellow. ‘Pollen taxa %’ means the relative abundance of pollen taxa in the Tunisian honey. In [<xref rid="B8-foods-10-00421" ref-type="bibr">8</xref>], taxa are referred to as: Amaranthaceae (instead of Chenopodiaceae), <italic>Erica</italic> (instead of Ericaceae), <italic>Borago</italic> (instead of Boraginaceae), Brassicaceae (instead of <italic>Brassica</italic> cf. <italic>napus</italic>), and Myrtaceae (instead of <italic>Myrtus</italic>), in [<xref rid="B10-foods-10-00421" ref-type="bibr">10</xref>]: ‘Graminees’ (instead of Poaceae), ‘Myrtacees’ instead of <italic>Myrtus</italic>), in [<xref rid="B9-foods-10-00421" ref-type="bibr">9</xref>]: <italic>Eucalyptus gomphocephalla</italic> (instead of <italic>Eucalyptus</italic>). Polygalaceae, found in low numbers (<0.5%) are not shown, as flowering data is not available for this region.</p></caption><graphic xlink:href="foods-10-00421-g001"></graphic></fig><fig id="foods-10-00421-f002" orientation="portrait" position="float"><label>Figure 2</label><caption><p>Silicoflagellates and diatoms found in floral honey. (<bold>A</bold>,<bold>B</bold>). <italic>Dictyocha fibula</italic>. (<bold>C</bold>,<bold>D</bold>). <italic>Distephanopsis crux</italic>. (<bold>E</bold>). <italic>Stephanocha speculum speculum</italic>. (<bold>F</bold>)<bold>.</bold><italic>Stephanocha speculum speculum</italic> f. <italic>notabilis</italic>. (<bold>G</bold>–<bold>I</bold>). <italic>Stephanocha speculum.</italic> (<bold>A</bold>–<bold>F</bold>) from Tunisia, (<bold>G</bold>) Poland, (<bold>H</bold>) Romania, (<bold>I</bold>) Greece. Scale bar: 20 µm.</p></caption><graphic xlink:href="foods-10-00421-g002"></graphic></fig><fig id="foods-10-00421-f003" orientation="portrait" position="float"><label>Figure 3</label><caption><p>Diatoms, dinoflagellates, fungal spores, and pollen grains found in floral honey from Tunisia. (<bold>A</bold>,<bold>B</bold>). <italic>Thalassionema nitzschioides.</italic> (<bold>C</bold>). <italic>Mastogloia</italic> sp., (<bold>D</bold>). <italic>Actinocyclus divisus.</italic> (<bold>E</bold>). fragment of <italic>Coscinodiscus</italic>. (<bold>F</bold>). <italic>Coscinodiscus marginatus,</italic> (<bold>G</bold>). <italic>Actiniscus pentasterias.</italic> (<bold>H</bold>). <italic>Curvularia</italic> sp., (<bold>I</bold>). <italic>Acacia</italic> sp., (<bold>J</bold>). Polygalaceae sp., (<bold>K</bold>). <italic>Convolvulus</italic> sp., Scale bar: 20 µm.</p></caption><graphic xlink:href="foods-10-00421-g003"></graphic></fig><fig id="foods-10-00421-f004" orientation="portrait" position="float"><label>Figure 4</label><caption><p>An episode of air mass possibly transporting microfossils from the emission area (Caltanissetta, Sicily) to the honey harvesting area shown on an atmospheric dispersion sensitivity map [m<sup>−3</sup>] for the dust deflated between 18–6 UTC, 21–22 May 2011. Red dots in the small map show the distribution of Messinian diatomites.</p></caption><graphic xlink:href="foods-10-00421-g004"></graphic></fig><fig id="foods-10-00421-f005" orientation="portrait" position="float"><label>Figure 5</label><caption><p>A quarry located in the Carpathians, Sibiciu de Sus, Romania—a possible source of airborne microfossils. Photo courtesy of Emilia Tulan.</p></caption><graphic xlink:href="foods-10-00421-g005"></graphic></fig><fig id="foods-10-00421-f006" orientation="portrait" position="float"><label>Figure 6</label><caption><p>An episode of air mass possibly transporting microfossils from the emission area (red dot) to the honey harvesting area near Stróze, Poland; shown on an atmospheric dispersion sensitivity map [m<sup>−3</sup>] for the dust deflated on 26 August 2013. Red dots on the small map show the distribution of Oligocene-Miocene diatomites.</p></caption><graphic xlink:href="foods-10-00421-g006"></graphic></fig><table-wrap id="foods-10-00421-t001" orientation="portrait" position="float"><object-id pub-id-type="pii">foods-10-00421-t001_Table 1</object-id><label>Table 1</label><caption><p>Silicoflagellates, diatoms, and cyanobacteria found in honey samples.</p></caption><table frame="hsides" rules="groups"><thead><tr><th align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">Name</th><th align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">Chloroplast</th><th align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">Major Group</th><th align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">Occurrence</th><th align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">Habitat</th><th align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">Sample Code</th><th align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">Country</th><th align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">Source</th></tr></thead><tbody><tr><td align="center" valign="middle" style="border-bottom:solid thin" rowspan="1" colspan="1"><italic>Dictyocha fibula</italic> Ehrenberg </td><td align="center" valign="middle" style="border-bottom:solid thin" rowspan="1" colspan="1">no</td><td align="center" valign="middle" style="border-bottom:solid thin" rowspan="1" colspan="1">Silicoflagellata</td><td align="center" valign="middle" style="border-bottom:solid thin" rowspan="1" colspan="1">fossil</td><td align="center" valign="middle" style="border-bottom:solid thin" rowspan="1" colspan="1">marine</td><td align="center" valign="middle" style="border-bottom:solid thin" rowspan="1" colspan="1">FH29Af</td><td align="center" valign="middle" style="border-bottom:solid thin" rowspan="1" colspan="1">Tunisia</td><td align="center" valign="middle" style="border-bottom:solid thin" rowspan="1" colspan="1">floral</td></tr><tr><td align="center" valign="middle" style="border-bottom:solid thin" rowspan="1" colspan="1"><italic>Distephanopsis crux</italic> (Ehrenberg)</td><td align="center" valign="middle" style="border-bottom:solid thin" rowspan="1" colspan="1">no</td><td align="center" valign="middle" style="border-bottom:solid thin" rowspan="1" colspan="1">Silicoflagellata</td><td align="center" valign="middle" style="border-bottom:solid thin" rowspan="1" colspan="1">fossil</td><td align="center" valign="middle" style="border-bottom:solid thin" rowspan="1" colspan="1">marine</td><td align="center" valign="middle" style="border-bottom:solid thin" rowspan="1" colspan="1">FH29Af</td><td align="center" valign="middle" style="border-bottom:solid thin" rowspan="1" colspan="1">Tunisia</td><td align="center" valign="middle" style="border-bottom:solid thin" rowspan="1" colspan="1">floral</td></tr><tr><td align="center" valign="middle" style="border-bottom:solid thin" rowspan="1" colspan="1"><italic>Stephanocha speculum</italic> (Ehrenberg)</td><td align="center" valign="middle" style="border-bottom:solid thin" rowspan="1" colspan="1">no</td><td align="center" valign="middle" style="border-bottom:solid thin" rowspan="1" colspan="1">Silicoflagellata</td><td align="center" valign="middle" style="border-bottom:solid thin" rowspan="1" colspan="1">fossil</td><td align="center" valign="middle" style="border-bottom:solid thin" rowspan="1" colspan="1">marine</td><td align="center" valign="middle" style="border-bottom:solid thin" rowspan="1" colspan="1">FH25Af</td><td align="center" valign="middle" style="border-bottom:solid thin" rowspan="1" colspan="1">Africa</td><td align="center" valign="middle" style="border-bottom:solid thin" rowspan="1" colspan="1">floral</td></tr><tr><td align="center" valign="middle" style="border-bottom:solid thin" rowspan="1" colspan="1"><italic>Stephanocha speculum</italic></td><td align="center" valign="middle" style="border-bottom:solid thin" rowspan="1" colspan="1">no</td><td align="center" valign="middle" style="border-bottom:solid thin" rowspan="1" colspan="1">Silicoflagellata</td><td align="center" valign="middle" style="border-bottom:solid thin" rowspan="1" colspan="1">fossil</td><td align="center" valign="middle" style="border-bottom:solid thin" rowspan="1" colspan="1">marine</td><td align="center" valign="middle" style="border-bottom:solid thin" rowspan="1" colspan="1">HP09Gr</td><td align="center" valign="middle" style="border-bottom:solid thin" rowspan="1" colspan="1">Greece</td><td align="center" valign="middle" style="border-bottom:solid thin" rowspan="1" colspan="1">honeydew, <italic>Pinus</italic></td></tr><tr><td align="center" valign="middle" style="border-bottom:solid thin" rowspan="1" colspan="1"><italic>Stephanocha speculum</italic></td><td align="center" valign="middle" style="border-bottom:solid thin" rowspan="1" colspan="1">no</td><td align="center" valign="middle" style="border-bottom:solid thin" rowspan="1" colspan="1">Silicoflagellata</td><td align="center" valign="middle" style="border-bottom:solid thin" rowspan="1" colspan="1">fossil</td><td align="center" valign="middle" style="border-bottom:solid thin" rowspan="1" colspan="1">marine</td><td align="center" valign="middle" style="border-bottom:solid thin" rowspan="1" colspan="1">FH33Po</td><td align="center" valign="middle" style="border-bottom:solid thin" rowspan="1" colspan="1">Poland</td><td align="center" valign="middle" style="border-bottom:solid thin" rowspan="1" colspan="1">floral, <italic>Fagopyrum</italic></td></tr><tr><td align="center" valign="middle" style="border-bottom:solid thin" rowspan="1" colspan="1"><italic>Stephanocha speculum</italic></td><td align="center" valign="middle" style="border-bottom:solid thin" rowspan="1" colspan="1">no</td><td align="center" valign="middle" style="border-bottom:solid thin" rowspan="1" colspan="1">Silicoflagellata</td><td align="center" valign="middle" style="border-bottom:solid thin" rowspan="1" colspan="1">fossil</td><td align="center" valign="middle" style="border-bottom:solid thin" rowspan="1" colspan="1">marine</td><td align="center" valign="middle" style="border-bottom:solid thin" rowspan="1" colspan="1">UK02Ro</td><td align="center" valign="middle" style="border-bottom:solid thin" rowspan="1" colspan="1">Romania</td><td align="center" valign="middle" style="border-bottom:solid thin" rowspan="1" colspan="1">unknown</td></tr><tr><td align="center" valign="middle" rowspan="1" colspan="1"><italic>Stephanocha</italic> cf. <italic>speculum</italic> (Ehrenberg)</td><td align="center" valign="middle" rowspan="1" colspan="1">no</td><td align="center" valign="middle" rowspan="1" colspan="1">Silicoflagellata</td><td align="center" valign="middle" rowspan="1" colspan="1">fossil</td><td align="center" valign="middle" rowspan="1" colspan="1">marine</td><td align="center" valign="middle" rowspan="1" colspan="1">FH28Af</td><td align="center" valign="middle" rowspan="1" colspan="1">Morocco</td><td align="center" valign="middle" rowspan="1" colspan="1">floral</td></tr><tr><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1"><italic>Stephanocha speculum speculum</italic> (Ehrenberg)</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">no</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">Silicoflagellata</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">fossil</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">marine</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">FH29Af</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">Tunisia</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">floral</td></tr><tr><td align="center" valign="middle" rowspan="1" colspan="1"><italic>Stephanocha speculum speculum f. notabilis</italic> Locker & Martini</td><td align="center" valign="middle" rowspan="1" colspan="1">no</td><td align="center" valign="middle" rowspan="1" colspan="1">Silicoflagellata</td><td align="center" valign="middle" rowspan="1" colspan="1">fossil</td><td align="center" valign="middle" rowspan="1" colspan="1">marine</td><td align="center" valign="middle" rowspan="1" colspan="1">FH29Af</td><td align="center" valign="middle" rowspan="1" colspan="1">Tunisia</td><td align="center" valign="middle" rowspan="1" colspan="1">floral</td></tr><tr><td align="center" valign="middle" rowspan="1" colspan="1"><italic>Achnanthes</italic> sp.</td><td align="center" valign="middle" rowspan="1" colspan="1">no</td><td align="center" valign="middle" rowspan="1" colspan="1">Diatom</td><td align="center" valign="middle" rowspan="1" colspan="1">*</td><td align="center" valign="middle" rowspan="1" colspan="1">freshwater</td><td align="center" valign="middle" rowspan="1" colspan="1">UK05Cz</td><td align="center" valign="middle" rowspan="1" colspan="1">Czech Republic</td><td align="center" valign="middle" rowspan="1" colspan="1">unknown</td></tr><tr><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1"><italic>Achnanthes</italic> sp.</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">living</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">Diatom</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">*</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">freshwater</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">UK05Cz</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">Czech Republic</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">unknown</td></tr><tr><td align="center" valign="middle" rowspan="1" colspan="1"><italic>Achnanthidium</italic> sp.</td><td align="center" valign="middle" rowspan="1" colspan="1">living</td><td align="center" valign="middle" rowspan="1" colspan="1">Diatom</td><td align="center" valign="middle" rowspan="1" colspan="1">*</td><td align="center" valign="middle" rowspan="1" colspan="1">freshwater</td><td align="center" valign="middle" rowspan="1" colspan="1">HH19It</td><td align="center" valign="middle" rowspan="1" colspan="1">Italy</td><td align="center" valign="middle" rowspan="1" colspan="1">honeydew</td></tr><tr><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1"><italic>Actiniscus pentasterias</italic> Ehrenberg </td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">no</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">dinoflagellates </td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">fossil and actual</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">marine</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">FH29Af</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">Tunisia</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">floral</td></tr><tr><td align="center" valign="middle" rowspan="1" colspan="1"><italic>Actinocyclus divisus</italic> (Grunow) Hustedt</td><td align="center" valign="middle" rowspan="1" colspan="1">no</td><td align="center" valign="middle" rowspan="1" colspan="1">Diatom</td><td align="center" valign="middle" rowspan="1" colspan="1">fossil and actual</td><td align="center" valign="middle" rowspan="1" colspan="1">marine</td><td align="center" valign="middle" rowspan="1" colspan="1">FH29Af</td><td align="center" valign="middle" rowspan="1" colspan="1">Tunisia</td><td align="center" valign="middle" rowspan="1" colspan="1">floral</td></tr><tr><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1"><italic>Aulacodiscus</italic> sp.</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">no</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">Diatom</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">*</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">marine</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">UK02Ro</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">Romania</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">unknown</td></tr><tr><td align="center" valign="middle" rowspan="1" colspan="1"><italic>Aulacoseira distans</italic> (Ehrenberg) Simonsen</td><td align="center" valign="middle" rowspan="1" colspan="1">no</td><td align="center" valign="middle" rowspan="1" colspan="1">Diatom</td><td align="center" valign="middle" rowspan="1" colspan="1">fossil and actual</td><td align="center" valign="middle" rowspan="1" colspan="1">freshwater</td><td align="center" valign="middle" rowspan="1" colspan="1">UK04Ge</td><td align="center" valign="middle" rowspan="1" colspan="1">Germany</td><td align="center" valign="middle" rowspan="1" colspan="1">unknown</td></tr><tr><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1"><italic>Aulacoseira distans</italic> (Ehrenberg) Simonsen</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">no</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">Diatom</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">fossil and actual</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">freshwater</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">HC04It</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">Italy</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">floral, <italic>Castanea</italic></td></tr><tr><td align="center" valign="middle" rowspan="1" colspan="1"><italic>Aulacoseira distans</italic> (Ehrenberg) Simonsen </td><td align="center" valign="middle" rowspan="1" colspan="1">no</td><td align="center" valign="middle" rowspan="1" colspan="1">Diatom</td><td align="center" valign="middle" rowspan="1" colspan="1">fossil and actual</td><td align="center" valign="middle" rowspan="1" colspan="1">freshwater</td><td align="center" valign="middle" rowspan="1" colspan="1">UK02Ro</td><td align="center" valign="middle" rowspan="1" colspan="1">Romania</td><td align="center" valign="middle" rowspan="1" colspan="1">unknown</td></tr><tr><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1"><italic>Aulacoseira</italic> cf. <italic>distans</italic> (Ehrenberg) Simonsen</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">no</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">Diatom</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">fossil and actual</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">freshwater</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">FH33Po</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">Poland</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">floral, <italic>Fagopyrum</italic></td></tr><tr><td align="center" valign="middle" rowspan="1" colspan="1"><italic>Aulacoseira</italic> sp.</td><td align="center" valign="middle" rowspan="1" colspan="1">no</td><td align="center" valign="middle" rowspan="1" colspan="1">Diatom</td><td align="center" valign="middle" rowspan="1" colspan="1">*</td><td align="center" valign="middle" rowspan="1" colspan="1">freshwater</td><td align="center" valign="middle" rowspan="1" colspan="1">UK02Ro</td><td align="center" valign="middle" rowspan="1" colspan="1">Romania</td><td align="center" valign="middle" rowspan="1" colspan="1">unknown</td></tr><tr><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1"><italic>Aulacoseira</italic> sp. </td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">no</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">Diatom</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">*</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">freshwater</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">HA05Gr</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">Greece</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">honeydew, <italic>Abies</italic></td></tr><tr><td align="center" valign="middle" rowspan="1" colspan="1"><italic>Chroococcus</italic> sp.</td><td align="center" valign="middle" rowspan="1" colspan="1">living</td><td align="center" valign="middle" rowspan="1" colspan="1">Cyanobacteria</td><td align="center" valign="middle" rowspan="1" colspan="1">*</td><td align="center" valign="middle" rowspan="1" colspan="1">mainly freshwater</td><td align="center" valign="middle" rowspan="1" colspan="1">HA05Gr</td><td align="center" valign="middle" rowspan="1" colspan="1">Greece</td><td align="center" valign="middle" rowspan="1" colspan="1">honeydew, <italic>Abies</italic></td></tr><tr><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1"><italic>Chroococcus</italic> sp.</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">living</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">Cyanobacteria</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">*</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">mainly freshwater</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">UK07Sv</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">Switzerland</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">unknown</td></tr><tr><td align="center" valign="middle" rowspan="1" colspan="1"><italic>Chroococcus</italic> sp.</td><td align="center" valign="middle" rowspan="1" colspan="1">living</td><td align="center" valign="middle" rowspan="1" colspan="1">Cyanobacteria</td><td align="center" valign="middle" rowspan="1" colspan="1">*</td><td align="center" valign="middle" rowspan="1" colspan="1">mainly freshwater</td><td align="center" valign="middle" rowspan="1" colspan="1">HH29Sl</td><td align="center" valign="middle" rowspan="1" colspan="1">Slovakia</td><td align="center" valign="middle" rowspan="1" colspan="1">honeydew</td></tr><tr><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1"><italic>Chroococcus</italic> sp.</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">living</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">Cyanobacteria</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">*</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">mainly freshwater</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">UK04Ge</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">Germany</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">unknown</td></tr><tr><td align="center" valign="middle" rowspan="1" colspan="1"><italic>Chroococcus</italic> sp.</td><td align="center" valign="middle" rowspan="1" colspan="1">living</td><td align="center" valign="middle" rowspan="1" colspan="1">Cyanobacteria</td><td align="center" valign="middle" rowspan="1" colspan="1">*</td><td align="center" valign="middle" rowspan="1" colspan="1">mainly freshwater</td><td align="center" valign="middle" rowspan="1" colspan="1">FH14Mx</td><td align="center" valign="middle" rowspan="1" colspan="1">Mexico</td><td align="center" valign="middle" rowspan="1" colspan="1">floral</td></tr><tr><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1"><italic>Chroococcus</italic> sp.</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">living</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">Cyanobacteria</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">*</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">mainly freshwater</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">HH04It</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">Italy</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">honeydew</td></tr><tr><td align="center" valign="middle" rowspan="1" colspan="1"><italic>Chroococcus</italic> sp.</td><td align="center" valign="middle" rowspan="1" colspan="1">living</td><td align="center" valign="middle" rowspan="1" colspan="1">Cyanobacteria</td><td align="center" valign="middle" rowspan="1" colspan="1">*</td><td align="center" valign="middle" rowspan="1" colspan="1">mainly freshwater</td><td align="center" valign="middle" rowspan="1" colspan="1">HH04It</td><td align="center" valign="middle" rowspan="1" colspan="1">Italy</td><td align="center" valign="middle" rowspan="1" colspan="1">honeydew</td></tr><tr><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1"><italic>Chroococcus</italic> sp.</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">living</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">Cyanobacteria</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">*</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">mainly freshwater</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">UK05Cz</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">Czech Republic</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">unknown</td></tr><tr><td align="center" valign="middle" rowspan="1" colspan="1"><italic>Coscinodiscus</italic> ? sp. </td><td align="center" valign="middle" rowspan="1" colspan="1">no</td><td align="center" valign="middle" rowspan="1" colspan="1">Diatom</td><td align="center" valign="middle" rowspan="1" colspan="1">fossil and actual</td><td align="center" valign="middle" rowspan="1" colspan="1">marine</td><td align="center" valign="middle" rowspan="1" colspan="1">FH33Po</td><td align="center" valign="middle" rowspan="1" colspan="1">Poland</td><td align="center" valign="middle" rowspan="1" colspan="1">floral, <italic>Fagopyrum</italic></td></tr><tr><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1"><italic>Coscinodiscus</italic> ? sp. </td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">no</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">Diatom</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">fossil and actual</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">marine</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">FH29Af</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">Tunisia</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">floral</td></tr><tr><td align="center" valign="middle" rowspan="1" colspan="1"><italic>Coscinodiscus marginatus</italic> Ehrenberg </td><td align="center" valign="middle" rowspan="1" colspan="1">no</td><td align="center" valign="middle" rowspan="1" colspan="1">Diatom</td><td align="center" valign="middle" rowspan="1" colspan="1">fossil and actual</td><td align="center" valign="middle" rowspan="1" colspan="1">marine</td><td align="center" valign="middle" rowspan="1" colspan="1">FH29Af</td><td align="center" valign="middle" rowspan="1" colspan="1">Tunisia</td><td align="center" valign="middle" rowspan="1" colspan="1">floral</td></tr><tr><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1"><italic>Coscinodiscus</italic> sp.</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">no</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">Diatom</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">fossil and actual</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">marine</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">UK02Ro</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">Romania</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">unknown</td></tr><tr><td align="center" valign="middle" rowspan="1" colspan="1"><italic>Cyclostephanos dubius</italic> Hustedt (Round)</td><td align="center" valign="middle" rowspan="1" colspan="1">no</td><td align="center" valign="middle" rowspan="1" colspan="1">Diatom</td><td align="center" valign="middle" rowspan="1" colspan="1">fossil and actual</td><td align="center" valign="middle" rowspan="1" colspan="1">freshwater</td><td align="center" valign="middle" rowspan="1" colspan="1">HA04Gr</td><td align="center" valign="middle" rowspan="1" colspan="1">Greece</td><td align="center" valign="middle" rowspan="1" colspan="1">honeydew, <italic>Abies</italic></td></tr><tr><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1"><italic>Cyclostephanos dubius</italic> Hustedt (Round)</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">no</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">Diatom</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">fossil and actual</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">freshwater</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">HA05Gr</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">Greece</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">honeydew, <italic>Abies</italic></td></tr><tr><td align="center" valign="middle" rowspan="1" colspan="1"><italic>Cyclotella</italic> sp. </td><td align="center" valign="middle" rowspan="1" colspan="1">no</td><td align="center" valign="middle" rowspan="1" colspan="1">Diatom</td><td align="center" valign="middle" rowspan="1" colspan="1">fossil and actual</td><td align="center" valign="middle" rowspan="1" colspan="1">freshwater</td><td align="center" valign="middle" rowspan="1" colspan="1">HH31Hu</td><td align="center" valign="middle" rowspan="1" colspan="1">Hungary</td><td align="center" valign="middle" rowspan="1" colspan="1">honeydew</td></tr><tr><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1"><italic>Fragilaria</italic> ? sp. </td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">?</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">Diatom</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">?</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">freshwater </td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">FH29Af</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">Tunisia</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">floral</td></tr><tr><td align="center" valign="middle" rowspan="1" colspan="1"><italic>Fragilaria intermedia?</italic> Grunow (Grunow)</td><td align="center" valign="middle" rowspan="1" colspan="1">living</td><td align="center" valign="middle" rowspan="1" colspan="1">Diatom</td><td align="center" valign="middle" rowspan="1" colspan="1">fossil? recent to actual</td><td align="center" valign="middle" rowspan="1" colspan="1">freshwater</td><td align="center" valign="middle" rowspan="1" colspan="1">UK05Cz</td><td align="center" valign="middle" rowspan="1" colspan="1">Czech Republic</td><td align="center" valign="middle" rowspan="1" colspan="1">unknown</td></tr><tr><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1"><italic>Fragilaria</italic>? sp.</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">no</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">Diatom</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">*</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">freshwater</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">HH30Hu</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">Hungary</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">honeydew</td></tr><tr><td align="center" valign="middle" rowspan="1" colspan="1"><italic>Hantschia amphioxys</italic> (Ehrenberg) Grunow</td><td align="center" valign="middle" rowspan="1" colspan="1">no</td><td align="center" valign="middle" rowspan="1" colspan="1">Diatom</td><td align="center" valign="middle" rowspan="1" colspan="1">fossil and actual</td><td align="center" valign="middle" rowspan="1" colspan="1">freshwater</td><td align="center" valign="middle" rowspan="1" colspan="1">FH33Po</td><td align="center" valign="middle" rowspan="1" colspan="1">Poland</td><td align="center" valign="middle" rowspan="1" colspan="1">floral, <italic>Fagopyrum</italic></td></tr><tr><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1"><italic>Hantzschia amphioxys</italic> Ehrenberg (Grunow)</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">no</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">Diatom</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">fossil and actual</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">freshwater</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">HH31Hu</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">Hungary</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">honeydew</td></tr><tr><td align="center" valign="middle" rowspan="1" colspan="1"><italic>Mastogloia</italic> ? sp.</td><td align="center" valign="middle" rowspan="1" colspan="1">living</td><td align="center" valign="middle" rowspan="1" colspan="1">Diatom</td><td align="center" valign="middle" rowspan="1" colspan="1">*</td><td align="center" valign="middle" rowspan="1" colspan="1">freshwater/brackish</td><td align="center" valign="middle" rowspan="1" colspan="1">FH29Af</td><td align="center" valign="middle" rowspan="1" colspan="1">Tunisia</td><td align="center" valign="middle" rowspan="1" colspan="1">floral</td></tr><tr><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1"><italic>Nitzschia</italic> ? sp. </td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">no</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">Diatom</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">?</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">marine?</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">FH29Af</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">Tunisia</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">floral</td></tr><tr><td align="center" valign="middle" rowspan="1" colspan="1"><italic>Nitzschia paleacea</italic> Grunow in van Heurck</td><td align="center" valign="middle" rowspan="1" colspan="1">living</td><td align="center" valign="middle" rowspan="1" colspan="1">Diatom</td><td align="center" valign="middle" rowspan="1" colspan="1">*</td><td align="center" valign="middle" rowspan="1" colspan="1">freshwater</td><td align="center" valign="middle" rowspan="1" colspan="1">HH30Hu</td><td align="center" valign="middle" rowspan="1" colspan="1">Hungary</td><td align="center" valign="middle" rowspan="1" colspan="1">honeydew</td></tr><tr><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1"><italic>Nitzschia</italic> sp.</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">living</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">Diatom</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">*</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">freshwater</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">FH20Cu</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">Cuba</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">floral</td></tr><tr><td align="center" valign="middle" rowspan="1" colspan="1"><italic>Nitzschia</italic> sp.</td><td align="center" valign="middle" rowspan="1" colspan="1">living</td><td align="center" valign="middle" rowspan="1" colspan="1">Diatom</td><td align="center" valign="middle" rowspan="1" colspan="1">*</td><td align="center" valign="middle" rowspan="1" colspan="1">freshwater</td><td align="center" valign="middle" rowspan="1" colspan="1">UK07Sv</td><td align="center" valign="middle" rowspan="1" colspan="1">Switzerland</td><td align="center" valign="middle" rowspan="1" colspan="1">unknown</td></tr><tr><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1"><italic>Nitzschia</italic> sp.</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">living</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">Diatom</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">*</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">freshwater</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">FH31Hu</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">Hungary</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">floral, <italic>Foeniculum</italic></td></tr><tr><td align="center" valign="middle" rowspan="1" colspan="1"><italic>Nitzschia</italic> sp.</td><td align="center" valign="middle" rowspan="1" colspan="1">living</td><td align="center" valign="middle" rowspan="1" colspan="1">Diatom</td><td align="center" valign="middle" rowspan="1" colspan="1">*</td><td align="center" valign="middle" rowspan="1" colspan="1">freshwater</td><td align="center" valign="middle" rowspan="1" colspan="1">FH31Hu</td><td align="center" valign="middle" rowspan="1" colspan="1">Hungary</td><td align="center" valign="middle" rowspan="1" colspan="1">floral, <italic>Foeniculum</italic></td></tr><tr><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1"><italic>Oscillatoria</italic> sp.</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">living</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">Cyanobacteria</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">*</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1"> mainly freshwater/marine</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">HA17Gr</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">Greece</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">honeydew, <italic>Abies</italic></td></tr><tr><td align="center" valign="middle" rowspan="1" colspan="1"><italic>Scenedesmus</italic> sp.</td><td align="center" valign="middle" rowspan="1" colspan="1">living</td><td align="center" valign="middle" rowspan="1" colspan="1">green algae</td><td align="center" valign="middle" rowspan="1" colspan="1">*</td><td align="center" valign="middle" rowspan="1" colspan="1">freshwater</td><td align="center" valign="middle" rowspan="1" colspan="1">HA15Gr</td><td align="center" valign="middle" rowspan="1" colspan="1">Greece</td><td align="center" valign="middle" rowspan="1" colspan="1">honeydew, <italic>Abies</italic></td></tr><tr><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1"><italic>Thalassionema nitzschioides</italic> (Grunow) Mereschkowsky</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">no</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">Diatom</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">fossil and actual</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">marine</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">FH29Af</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">Tunisia</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">floral</td></tr><tr><td align="center" valign="middle" rowspan="1" colspan="1">centric sp.</td><td align="center" valign="middle" rowspan="1" colspan="1">no</td><td align="center" valign="middle" rowspan="1" colspan="1">Diatom</td><td align="center" valign="middle" rowspan="1" colspan="1">*</td><td align="center" valign="middle" rowspan="1" colspan="1">?</td><td align="center" valign="middle" rowspan="1" colspan="1">HH04It</td><td align="center" valign="middle" rowspan="1" colspan="1">Italy</td><td align="center" valign="middle" rowspan="1" colspan="1">honeydew</td></tr><tr><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">pennate sp.</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">living</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">Diatom</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">*</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">freshwater</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">HH08It</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">Italy</td><td align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">honeydew</td></tr><tr><td align="center" valign="middle" style="border-bottom:solid thin" rowspan="1" colspan="1">pennate sp.</td><td align="center" valign="middle" style="border-bottom:solid thin" rowspan="1" colspan="1">living</td><td align="center" valign="middle" style="border-bottom:solid thin" rowspan="1" colspan="1">Diatom</td><td align="center" valign="middle" style="border-bottom:solid thin" rowspan="1" colspan="1">*</td><td align="center" valign="middle" style="border-bottom:solid thin" rowspan="1" colspan="1">freshwater</td><td align="center" valign="middle" style="border-bottom:solid thin" rowspan="1" colspan="1">HA03Gr</td><td align="center" valign="middle" style="border-bottom:solid thin" rowspan="1" colspan="1">Greece</td><td align="center" valign="middle" style="border-bottom:solid thin" rowspan="1" colspan="1">honeydew, <italic>Abies</italic></td></tr></tbody></table><table-wrap-foot><fn><p>* for the living taxa not designated to species level, the geological record is not indicated.</p></fn></table-wrap-foot></table-wrap></floats-group></pmc></record>Pour manipuler ce document sous Unix (Dilib)
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