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<document id="D6652DD89EB7E2E695FFD60EB7043478" ID-DOI="10.11646/phytotaxa.365.1.1" ID-ISSN="1179-3163" ID-Zenodo-Dep="13704923" IM.bibliography_approvedBy="felipe" IM.illustrations_approvedBy="felipe" IM.materialsCitations_approvedBy="felipe" IM.metadata_approvedBy="felipe" IM.tables_requiresApprovalFor="GgImagineBatch" IM.taxonomicNames_approvedBy="felipe" IM.treatments_approvedBy="felipe" checkinTime="1725584015738" checkinUser="felipe" docAuthor="Mai, Truc, Johansen, Jeffrey R., Pietrasiak, Nicole, Bohunická, Markéta &amp; Martin, Michael P." docDate="2018" docId="03BFDE646C47FFAF009AFBC6FE80FD6F" docLanguage="en" docName="phytotaxa.365.1.1.pdf" docOrigin="Phytotaxa 365 (1)" docSource="http://dx.doi.org/10.11646/phytotaxa.365.1.1" docStyle="DocumentStyle:96748F8F1B6C902996E134952A3A36B9.13:Phytotaxa.2014-.journal_article" docStyleId="96748F8F1B6C902996E134952A3A36B9" docStyleName="Phytotaxa.2014-.journal_article" docStyleVersion="13" docTitle="Tildeniella nuda Mai, Johansen et Bohunicka 2018, sp. nov." docType="treatment" docVersion="2" lastPageNumber="44" masterDocId="FF86A61C6C6EFF840012FFAAFF98FF96" masterDocTitle="Revision of the Synechococcales (Cyanobacteria) through recognition of four families including Oculatellaceae fam. nov. and Trichocoleaceae fam. nov. and six new genera containing 14 species" masterLastPageNumber="59" masterPageNumber="1" pageNumber="42" updateTime="1725596029488" updateUser="ExternalLinkService" zenodo-license-figures="UNSPECIFIED" zenodo-license-treatments="UNSPECIFIED">
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<mods:title id="6FC648E3C7E0C52F49B1AE9AF5611A8B">Revision of the Synechococcales (Cyanobacteria) through recognition of four families including Oculatellaceae fam. nov. and Trichocoleaceae fam. nov. and six new genera containing 14 species</mods:title>
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<mods:namePart id="F6695F93CAD265784E41AA68EFA81BD3">Mai, Truc</mods:namePart>
<mods:affiliation id="448D9355862CBA8AC4D0C9B9B857E86F">Department of Biology, John Carroll University, 1 John Carroll Blvd., University Heights, Ohio 44118, USA &amp; Department of Plant and Environmental Sciences, New Mexico State University, Skeen Hall Room N 127, P. O Box 30003 MSC 3 Q, Las Cruces, New Mexico 88003, USA.</mods:affiliation>
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<mods:namePart id="FF2C706DF703A289760D222A7315FDAD">Johansen, Jeffrey R.</mods:namePart>
<mods:affiliation id="E442C28257AC168C3DC484DDD7BD4273">Department of Biology, John Carroll University, 1 John Carroll Blvd., University Heights, Ohio 44118, USA &amp; Department of Botany, Faculty of Science, University of South Bohemia, 31 Branišovská, 37005 České Budějovice, Czech Republic</mods:affiliation>
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<mods:namePart id="DD55AE562A83381F965D9F4D4CAE83EA">Pietrasiak, Nicole</mods:namePart>
<mods:affiliation id="88E9D1ABAD31C8B1579617BDA2977B7D">Department of Plant and Environmental Sciences, New Mexico State University, Skeen Hall Room N 127, P. O Box 30003 MSC 3 Q, Las Cruces, New Mexico 88003, USA.</mods:affiliation>
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<mods:namePart id="A6EC47222A8D1C7A115DC5EA38B33232">Bohunická, Markéta</mods:namePart>
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<mods:namePart id="3CFFC0558B8397ABD94EDB3EE45135C5">Martin, Michael P.</mods:namePart>
<mods:affiliation id="EA1E12A3D1615AAAF18C49473524704A">Department of Biology, John Carroll University, 1 John Carroll Blvd., University Heights, Ohio 44118, USA</mods:affiliation>
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<mods:date id="CACC345CDE3384CCACD9069097451459">2018</mods:date>
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<subSubSection id="C30C3CF96C47FFAD009AFBC6FD64FB13" box="[136,764,1132,1157]" pageId="41" pageNumber="42" type="nomenclature">
<paragraph id="8BA96F726C47FFAD009AFBC6FD64FB13" blockId="41.[136,1452,1132,2093]" box="[136,764,1132,1157]" pageId="41" pageNumber="42">
<heading id="D0E1D81E6C47FFAD009AFBC6FD64FB13" bold="true" box="[136,764,1132,1157]" fontSize="11" level="1" pageId="41" pageNumber="42" reason="1">
<emphasis id="B962B3606C47FFAD009AFBC6FD64FB13" bold="true" box="[136,764,1132,1157]" pageId="41" pageNumber="42">
<taxonomicName id="4C1614F16C47FFAD009AFBC6FD06FB13" authority="Mai, Johansen et Bohunicka" authorityName="Mai, Johansen et Bohunicka" authorityYear="2018" box="[136,670,1132,1157]" class="Cyanobacteriia" family="Oculatellaceae" genus="Tildeniella" higherTaxonomySource="GBIF" kingdom="Bacteria" order="Synechococcales" pageId="41" pageNumber="42" phylum="Cyanobacteria" rank="species" species="nuda" status="sp. nov.">
<emphasis id="B962B3606C47FFAD009AFBC6FEDEFB13" bold="true" box="[136,326,1132,1157]" italics="true" pageId="41" pageNumber="42">Tildeniella nuda</emphasis>
Mai, Johansen 
<emphasis id="B962B3606C47FFAD0210FBC6FD8EFB13" bold="true" box="[514,534,1132,1157]" italics="true" pageId="41" pageNumber="42">et</emphasis>
Bohunická
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<taxonomicNameLabel id="A2510E1B6C47FFAD02B7FBC6FD64FB13" box="[677,764,1132,1157]" pageId="41" pageNumber="42" rank="species">sp. nov.</taxonomicNameLabel>
</emphasis>
</emphasis>
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</paragraph>
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<subSubSection id="C30C3CF96C47FFAD009AFB3AFDE1FB67" pageId="41" pageNumber="42" type="diagnosis">
<paragraph id="8BA96F726C47FFAD009AFB3AFDE1FB67" blockId="41.[136,1452,1132,2093]" pageId="41" pageNumber="42">
<emphasis id="B962B3606C47FFAD009AFB3AFEB9FB3F" bold="true" box="[136,289,1168,1193]" pageId="41" pageNumber="42">Diagnosis:—</emphasis>
Different from 
<taxonomicName id="4C1614F16C47FFAD01D8FB3AFDACFB3F" authorityName="Mai, Johansen et Pietrasiak" authorityYear="2018" box="[458,564,1168,1193]" class="Cyanobacteriia" family="Oculatellaceae" genus="Tildeniella" higherTaxonomySource="GBIF" kingdom="Bacteria" order="Synechococcales" pageId="41" pageNumber="42" phylum="Cyanobacteria" rank="species" species="torsiva">
<emphasis id="B962B3606C47FFAD01D8FB3AFDACFB3F" box="[458,564,1168,1193]" italics="true" pageId="41" pageNumber="42">T. torsiva</emphasis>
</taxonomicName>
in the occasional presence of swollen cells and much narrower trichome width. Molecularly distinguished by from 
<taxonomicName id="4C1614F16C47FFAD0209FB1EFD1EFB5B" authorityName="Mai, Johansen et Pietrasiak" authorityYear="2018" box="[539,646,1204,1229]" class="Cyanobacteriia" family="Oculatellaceae" genus="Tildeniella" higherTaxonomySource="GBIF" kingdom="Bacteria" order="Synechococcales" pageId="41" pageNumber="42" phylum="Cyanobacteria" rank="species" species="torsiva">
<emphasis id="B962B3606C47FFAD0209FB1EFD1EFB5B" box="[539,646,1204,1229]" italics="true" pageId="41" pageNumber="42">T. torsiva</emphasis>
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by secondary structures of the D1-D1’ and Box B helices (
<figureCitation id="132D73F76C47FFAD0539FB1EFA3EFB5B" box="[1323,1446,1204,1229]" captionStart="FIGURE 6" captionStartId="15.[136,229,1976,1997]" captionTargetBox="[157,1425,273,1857]" captionTargetId="figure-14@15.[151,1436,267,1882]" captionTargetPageId="15" captionText="FIGURE 6. D1-D1’ stems of species described in Oculatellaceae.The stem structures of genera described previously in other publications (Oculatella, Thermoleptolyngbya, Timaviella) or in publications under provision (Trichotorquatus) are not shown here." figureDoi="http://doi.org/10.5281/zenodo.13704935" httpUri="https://zenodo.org/record/13704935/files/figure.png" pageId="41" pageNumber="42">Figs. 6n‒o</figureCitation>
, 
<figureCitation id="132D73F76C47FFAD009AFB72FF52FB67" box="[136,202,1240,1265]" captionStart="FIGURE 7" captionStartId="17.[136,229,1928,1949]" captionTargetBox="[314,1274,759,1806]" captionTargetId="figure-238@17.[311,1276,751,1831]" captionTargetPageId="17" captionText="FIGURE 7. Box B helices of species described in Oculatellaceae. The structures of genera described previously in other publications (Oculatella, Thermoleptolyngbya, Timaviella) or in publications under provision (Trichotorquatus) are not shown here." figureDoi="http://doi.org/10.5281/zenodo.13704937" httpUri="https://zenodo.org/record/13704937/files/figure.png" pageId="41" pageNumber="42">
<quantity id="4CEEC2976C47FFAD009AFB72FF34FB67" box="[136,172,1240,1265]" metricMagnitude="0" metricUnit="m" metricValue="7.0" pageId="41" pageNumber="42" unit="m" value="7.0">7m</quantity>
‒n
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), as well as by presence of a V2 helix.
</paragraph>
</subSubSection>
<subSubSection id="C30C3CF96C47FFAD00AFFB56FB7BF97F" pageId="41" pageNumber="42" type="description">
<paragraph id="8BA96F726C47FFAD00AFFB56FC76FA7B" blockId="41.[136,1452,1132,2093]" pageId="41" pageNumber="42">
<emphasis id="B962B3606C47FFAD00AFFB56FEF5FA83" bold="true" box="[189,365,1276,1301]" pageId="41" pageNumber="42">Description:—</emphasis>
Colony fasciculated, not penetrating the agar, forming a compact mat, with small evenly distributed, rounded clumps of trichomes, bright blue-green. Filaments relatively short (
<figureCitation id="132D73F76C47FFAD03C5FA8AFBAEFAAF" box="[983,1078,1312,1337]" captionStart="FIGURE 21" captionStartId="42.[136,229,1880,1901]" captionTargetBox="[151,1435,187,1852]" captionTargetId="figure-16@42.[151,1435,187,1852]" captionTargetPageId="42" captionText="FIGURE 21. Tildeniella nuda. A. Filaments short, Pseudanabaena-like, trichomes not or only slight constricted, connected by somewhat translucent cell wall; B–H. Cells sometimes distinctively elongated, bent or involuted (arrows). Scale bar 10μm in 1000X magnification." figureDoi="http://doi.org/10.5281/zenodo.13704977" httpUri="https://zenodo.org/record/13704977/files/figure.png" pageId="41" pageNumber="42">Fig. 21a</figureCitation>
), without false branching. Sheath usually absent, thin, firm and colorless when present, 1.0 
<emphasis id="B962B3606C47FFAD0312FAEEFC96FACB" bold="true" box="[768,782,1348,1373]" pageId="41" pageNumber="42">–</emphasis>
1.4 μm wide. Trichomes pale blue-green, clearly constricted at the cross-walls (
<figureCitation id="132D73F76C47FFAD014FFAC2FE7BFA17" box="[349,483,1384,1409]" captionStart="FIGURE 21" captionStartId="42.[136,229,1880,1901]" captionTargetBox="[151,1435,187,1852]" captionTargetId="figure-16@42.[151,1435,187,1852]" captionTargetPageId="42" captionText="FIGURE 21. Tildeniella nuda. A. Filaments short, Pseudanabaena-like, trichomes not or only slight constricted, connected by somewhat translucent cell wall; B–H. Cells sometimes distinctively elongated, bent or involuted (arrows). Scale bar 10μm in 1000X magnification." figureDoi="http://doi.org/10.5281/zenodo.13704977" httpUri="https://zenodo.org/record/13704977/files/figure.png" pageId="41" pageNumber="42">Figs. 21c–e</figureCitation>
), cell division occurring throughout the trichome, 1.0–1.2 μm wide. Hormogonia and necridia absent. Cells always longer than wide, sometimes elongated (
<figureCitation id="132D73F76C47FFAD0384FA26FB8AFA33" box="[918,1042,1420,1445]" captionStart="FIGURE 21" captionStartId="42.[136,229,1880,1901]" captionTargetBox="[151,1435,187,1852]" captionTargetId="figure-16@42.[151,1435,187,1852]" captionTargetPageId="42" captionText="FIGURE 21. Tildeniella nuda. A. Filaments short, Pseudanabaena-like, trichomes not or only slight constricted, connected by somewhat translucent cell wall; B–H. Cells sometimes distinctively elongated, bent or involuted (arrows). Scale bar 10μm in 1000X magnification." figureDoi="http://doi.org/10.5281/zenodo.13704977" httpUri="https://zenodo.org/record/13704977/files/figure.png" pageId="41" pageNumber="42">Fig. 21b–c</figureCitation>
), with mostly homogeneous content, rarely swollen (
<figureCitation id="132D73F76C47FFAD012AFA1AFE74FA5F" box="[312,492,1456,1481]" captionStart="FIGURE 21" captionStartId="42.[136,229,1880,1901]" captionTargetBox="[151,1435,187,1852]" captionTargetId="figure-16@42.[151,1435,187,1852]" captionTargetPageId="42" captionText="FIGURE 21. Tildeniella nuda. A. Filaments short, Pseudanabaena-like, trichomes not or only slight constricted, connected by somewhat translucent cell wall; B–H. Cells sometimes distinctively elongated, bent or involuted (arrows). Scale bar 10μm in 1000X magnification." figureDoi="http://doi.org/10.5281/zenodo.13704977" httpUri="https://zenodo.org/record/13704977/files/figure.png" pageId="41" pageNumber="42">Fig. 21d–e, g–h</figureCitation>
, at arrows) or with small granules at polar regions of cells, 2.0 
<emphasis id="B962B3606C47FFAD04BFFA1AFB23FA5F" bold="true" box="[1197,1211,1456,1481]" pageId="41" pageNumber="42">–</emphasis>
4.3 (5.1) long. Apical cells cylindrically rounded, sometimes apically swollen (
<figureCitation id="132D73F76C47FFAD0314FA7EFCE1FA7B" box="[774,889,1492,1517]" captionStart="FIGURE 21" captionStartId="42.[136,229,1880,1901]" captionTargetBox="[151,1435,187,1852]" captionTargetId="figure-16@42.[151,1435,187,1852]" captionTargetPageId="42" captionText="FIGURE 21. Tildeniella nuda. A. Filaments short, Pseudanabaena-like, trichomes not or only slight constricted, connected by somewhat translucent cell wall; B–H. Cells sometimes distinctively elongated, bent or involuted (arrows). Scale bar 10μm in 1000X magnification." figureDoi="http://doi.org/10.5281/zenodo.13704977" httpUri="https://zenodo.org/record/13704977/files/figure.png" pageId="41" pageNumber="42">Fig. 21a, f</figureCitation>
at arrow).
</paragraph>
<paragraph id="8BA96F726C47FFAD00AFFA52FB7BF97F" blockId="41.[136,1452,1132,2093]" pageId="41" pageNumber="42">
D1-D1’ helix 65 nucleotides long, basal 3’ unilateral bulge of 7 nucleotides long, with sequence 5’-CAUCCCA- 3’, with mid-helix with two mismatches of C/U and G/A at positions 9/50 and 22/39, one internal loop at position 25/35 
<emphasis id="B962B3606C47FFAD00DAF9EAFF4EF9CF" bold="true" box="[200,214,1600,1625]" pageId="41" pageNumber="42">–</emphasis>
36 immediately separated from the terminal loop by a 5’-GC:GC-3’ clamp, and two unpaired nucleotides at position 16–17 of the 5’ strand, with terminal loop sequence 5’-AUUUU-3’ (
<figureCitation id="132D73F76C47FFAD03CBF9CEFBB4F9EB" box="[985,1068,1636,1661]" captionStart="FIGURE 6" captionStartId="15.[136,229,1976,1997]" captionTargetBox="[157,1425,273,1857]" captionTargetId="figure-14@15.[151,1436,267,1882]" captionTargetPageId="15" captionText="FIGURE 6. D1-D1’ stems of species described in Oculatellaceae.The stem structures of genera described previously in other publications (Oculatella, Thermoleptolyngbya, Timaviella) or in publications under provision (Trichotorquatus) are not shown here." figureDoi="http://doi.org/10.5281/zenodo.13704935" httpUri="https://zenodo.org/record/13704935/files/figure.png" pageId="41" pageNumber="42">Fig. 6o</figureCitation>
). Box B helix 38 nucleotides long, with one internal loop at position 5/33–34 and one unpaired adenine residue at position 9 of the 5’ strand (
<figureCitation id="132D73F76C47FFAD055BF922FA06F937" box="[1353,1438,1672,1697]" captionStart="FIGURE 7" captionStartId="17.[136,229,1928,1949]" captionTargetBox="[314,1274,759,1806]" captionTargetId="figure-238@17.[311,1276,751,1831]" captionTargetPageId="17" captionText="FIGURE 7. Box B helices of species described in Oculatellaceae. The structures of genera described previously in other publications (Oculatella, Thermoleptolyngbya, Timaviella) or in publications under provision (Trichotorquatus) are not shown here." figureDoi="http://doi.org/10.5281/zenodo.13704937" httpUri="https://zenodo.org/record/13704937/files/figure.png" pageId="41" pageNumber="42">Fig. 7n</figureCitation>
). V2 helix 77 nucleotides long, with one small internal loop at position 10–11/68 and one large internal loop at position 24–26/51–55 (
<figureCitation id="132D73F76C47FFAD0139F97AFEE0F97F" box="[299,376,1744,1769]" captionStart="FIGURE 8" captionStartId="18.[136,229,1187,1208]" captionTargetBox="[152,1434,425,1107]" captionTargetId="figure-143@18.[151,1436,422,1162]" captionTargetPageId="18" captionText="FIGURE 8. V2 helices of species described in Oculatellaceae. Several species do not have this structure, including Pegethrix convoluta, P. indistincta, Antartic Pegethrix species, Cartusia fontana¸ Kaiparowitsia implicata." figureDoi="http://doi.org/10.5281/zenodo.13704941" httpUri="https://zenodo.org/record/13704941/files/figure.png" pageId="41" pageNumber="42">Fig. 8j</figureCitation>
). V3 helix not reported here due to short sequence missing the end of the ITS.
</paragraph>
</subSubSection>
<subSubSection id="C30C3CF96C47FFAD00AFF95EFB81F89B" box="[189,1049,1780,1805]" pageId="41" pageNumber="42" type="etymology">
<paragraph id="8BA96F726C47FFAD00AFF95EFB81F89B" blockId="41.[136,1452,1132,2093]" box="[189,1049,1780,1805]" pageId="41" pageNumber="42">
<emphasis id="B962B3606C47FFAD00AFF95EFEFCF89B" bold="true" box="[189,356,1780,1805]" pageId="41" pageNumber="42">Etymology:—</emphasis>
<emphasis id="B962B3606C47FFAD0176F95EFE3FF89B" box="[356,423,1780,1805]" italics="true" pageId="41" pageNumber="42">nudus</emphasis>
(L.): naked, referring to the frequent absence of sheath.
</paragraph>
</subSubSection>
<subSubSection id="C30C3CF96C47FFAF00AFF8B2FE80FD6F" lastPageId="43" lastPageNumber="44" pageId="41" pageNumber="42" type="materials_examined">
<paragraph id="8BA96F726C47FFAD00AFF8B2FA8AF8A7" blockId="41.[136,1452,1132,2093]" box="[189,1298,1816,1841]" pageId="41" pageNumber="42">
<emphasis id="B962B3606C47FFAD00AFF8B2FEE3F8A7" bold="true" box="[189,379,1816,1841]" pageId="41" pageNumber="42">Type locality:—</emphasis>
<collectingCountry id="F3012FE26C47FFAD0169F8B2FD9CF8A7" box="[379,516,1816,1841]" name="Switzerland" pageId="41" pageNumber="42">Switzerland</collectingCountry>
, Stansstaad, collected by Zehnder in 1965; found on a wet stone wall.
</paragraph>
<paragraph id="8BA96F726C47FFAD00AFF896FE8FF8EF" blockId="41.[136,1452,1132,2093]" pageId="41" pageNumber="42">
<materialsCitation id="3B7E652F6C47FFAD00AFF896FE8FF8EF" collectionCode="BRY" collectorName="Monte L. Bean Museum" location="Utah" pageId="41" pageNumber="42" specimenCode="BRY37782" specimenCount="1" stateProvince="Utah" typeStatus="holotype">
<emphasis id="B962B3606C47FFAD00AFF896FD8FF8C3" bold="true" box="[189,535,1852,1877]" pageId="41" pageNumber="42">
<typeStatus id="54ADD1D06C47FFAD00AFF896FEB2F8C3" box="[189,298,1852,1877]" pageId="41" pageNumber="42" type="holotype">Holotype</typeStatus>
here designated:—
</emphasis>
<specimenCode id="DBB0C7096C47FFAD0204F896FD05F8C3" box="[534,669,1852,1877]" collectionCode="BRY" country="USA" httpUri="http://biocol.org/urn:lsid:biocol.org:col:15673" lsid="urn:lsid:biocol.org:col:15673" name="Brigham Young University - S.L. Welsh Herbarium" pageId="41" pageNumber="42" type="Herbarium">BRY37782</specimenCode>
!, Herbarium for Nonvascular Cryptogams, 
<collectorName id="26E30AA46C47FFAD0499F896FA3FF8C3" box="[1163,1447,1852,1877]" pageId="41" pageNumber="42">Monte L. Bean Museum</collectorName>
, Provo, 
<collectingRegion id="49D2A1906C47FFAD00CBF8CAFE8BF8EF" box="[217,275,1888,1913]" country="United States of America" name="Utah" pageId="41" pageNumber="42">Utah</collectingRegion>
.
</materialsCitation>
</paragraph>
<paragraph id="8BA96F726C47FFAD00AFF82EFA39F80B" blockId="41.[136,1452,1132,2093]" box="[189,1441,1924,1949]" pageId="41" pageNumber="42">
<emphasis id="B962B3606C47FFAD00AFF82EFE3FF80B" bold="true" box="[189,423,1924,1949]" pageId="41" pageNumber="42">Reference strain:—</emphasis>
Zehnder 1965/U140, Algal Culture Collection at John Carroll University, Cleveland, 
<collectingCountry id="F3012FE26C47FFAD0573F82EFA05F80B" box="[1377,1437,1924,1949]" name="United States of America" pageId="41" pageNumber="42">USA</collectingCountry>
.
</paragraph>
<paragraph id="8BA96F726C47FFAF00AFF802FAE1FDD3" blockId="41.[136,1452,1132,2093]" lastBlockId="43.[136,1452,160,761]" lastPageId="43" lastPageNumber="44" pageId="41" pageNumber="42">
<emphasis id="B962B3606C47FFAD00AFF802FE28F857" bold="true" box="[189,432,1960,1985]" pageId="41" pageNumber="42">Taxonomic notes:—</emphasis>
This species is character poor, lacking features useful for recognition such as necridia, hormogonia, coiling or nodule formation, or false branching. Given its lack of features, it could fit a number of species belonging within 
<taxonomicName id="4C1614F16C47FFAD01B6F85AFDE9F79F" box="[420,625,2032,2057]" class="Cyanobacteriia" family="Leptolyngbyaceae" higherTaxonomySource="GBIF" kingdom="Bacteria" order="Synechococcales" pageId="41" pageNumber="42" phylum="Cyanobacteria" rank="family">Leptolyngbyaceae</taxonomicName>
<emphasis id="B962B3606C47FFAD026AF85AFD71F79F" box="[632,745,2032,2057]" italics="true" pageId="41" pageNumber="42">sensu lato</emphasis>
<bibRefCitation id="EF8712836C47FFAD02FDF85AFBF9F79F" author="Komarek, J. &amp; Anagnostidis, K." box="[751,1121,2032,2057]" pageId="41" pageNumber="42" refId="ref34263" refString="Komarek, J. &amp; Anagnostidis, K. (2005) Cyanoprokaryota II. In: Budel, B., Krienitz, L., Gartner, G. &amp; Schagerl, M. (Eds.) Susswasserflora von Mittleuropa 19 / 2. Elsevier / Spektrum, Munchen, 759 pp." type="book" year="2005">Komárek &amp; Anagnostidis (2005)</bibRefCitation>
. The cell morphology (length to width ratio, dimensions) is similar to most 
<taxonomicName id="4C1614F16C47FFAD0287F7BEFCF0F7BB" box="[661,872,2068,2093]" pageId="41" pageNumber="42">
<emphasis id="B962B3606C47FFAD0287F7BEFC93F7BB" box="[661,779,2068,2093]" italics="true" pageId="41" pageNumber="42">Oculatella</emphasis>
species
</taxonomicName>
, but 
<taxonomicName id="4C1614F16C47FFAD03B0F7BEFC6FF7BB" authorityName="Mai, Johansen et Bohunicka" authorityYear="2018" box="[930,1015,2068,2093]" class="Cyanobacteriia" family="Oculatellaceae" genus="Tildeniella" higherTaxonomySource="GBIF" kingdom="Bacteria" order="Synechococcales" pageId="41" pageNumber="42" phylum="Cyanobacteria" rank="species" species="nuda">
<emphasis id="B962B3606C47FFAD03B0F7BEFC6FF7BB" box="[930,1015,2068,2093]" italics="true" pageId="41" pageNumber="42">T. nuda</emphasis>
</taxonomicName>
lacks the characteristic apical cells of that genus. The closest fit is 
<taxonomicName id="4C1614F16C44FFAE01D9F7A3FD76F7B4" authority="Komarek" authorityName="Komarek" box="[459,750,2057,2082]" class="Cyanophyceae" family="Oscillatoriaceae" genus="Leptolyngbya" kingdom="Bacteria" order="Nostocales" pageId="42" pageNumber="43" phylum="Cyanobacteria" rank="species" species="hansgirgiana">
<emphasis id="B962B3606C44FFAE01D9F7A3FDE6F7B4" box="[459,638,2057,2082]" italics="true" pageId="42" pageNumber="43">L. hansgirgiana</emphasis>
Komárek
</taxonomicName>
in 
<bibRefCitation id="EF8712836C44FFAE0300F7A3FBACF7B4" author="Anagnostidis, K." box="[786,1076,2057,2082]" pageId="42" pageNumber="43" pagination="359 - 375" refId="ref30726" refString="Anagnostidis, K. (2001) Nomenclatural changes in cyanoprokaryotic order Oscillatoriales. Preslia 73: 359 - 375." type="journal article" year="2001">Anagnostidis (2001: 374)</bibRefCitation>
, but this taxon has a complicated taxonomic history. It was first described as 
<taxonomicName id="4C1614F16C45FFAF0264FF0AFB57FF2F" authority="Nageli ex Kutzing (1849: 265)" authorityName="Kutzing" authorityPageNumber="265" authorityYear="1849" box="[630,1231,160,185]" class="Betaproteobacteria" genus="Leptothrix" kingdom="Bacteria" order="Burkholderiales" pageId="43" pageNumber="44" phylum="Proteobacteria" rank="species" species="tenuissima">
<emphasis id="B962B3606C45FFAF0264FF0AFCF3FF2F" box="[630,875,160,185]" italics="true" pageId="43" pageNumber="44">Leptothrix tenuissima</emphasis>
Nägeli 
<emphasis id="B962B3606C45FFAF03D7FF0AFC46FF2F" box="[965,990,160,185]" italics="true" pageId="43" pageNumber="44">ex</emphasis>
Kützing (1849: 265)
</taxonomicName>
, then transferred to 
<taxonomicName id="4C1614F16C45FFAF009AFF6EFC98FF4B" authority="(Nageli) Rabenhorst (1865: 77)" authorityName="Rabenhorst" authorityPageNumber="77" authorityYear="1865" baseAuthorityName="Nageli" box="[136,768,196,221]" class="Cyanobacteriia" family="Pseudanabaenaceae" genus="Hypheothrix" higherTaxonomySource="GBIF" kingdom="Bacteria" order="Pseudanabaenales" pageId="43" pageNumber="44" phylum="Cyanobacteria" rank="species" species="tenuissima">
<emphasis id="B962B3606C45FFAF009AFF6EFE0CFF4B" box="[136,404,196,221]" italics="true" pageId="43" pageNumber="44">Hypheothrix tenuissima</emphasis>
(Nägeli) 
<bibRefCitation id="EF8712836C45FFAF0212FF6EFC98FF4B" author="Rabenhorst, L." box="[512,768,196,221]" pageId="43" pageNumber="44" pagination="1 - 139" refId="ref36278" refString="Rabenhorst, L. (1865) Flora europaea algarum aquae dulcis et submarinae. Sectio II. Algas phycochromaceas complectens. Lipsiae: Apud Eduardum Kummerum, Leipzig, pp. 1 - 139." type="book chapter" year="1865">Rabenhorst (1865: 77)</bibRefCitation>
</taxonomicName>
, and finally to 
<taxonomicName id="4C1614F16C45FFAF03BBFF6EFF26FE97" authority="(Nageli) Hansgirg (1891: 346)" authorityName="Hansgirg" authorityPageNumber="346" authorityYear="1891" baseAuthorityName="Nageli" class="Cyanophyceae" family="Oscillatoriaceae" genus="Lyngbya" kingdom="Bacteria" order="Nostocales" pageId="43" pageNumber="44" phylum="Cyanobacteria" rank="species" species="tenuissima">
<emphasis id="B962B3606C45FFAF03BBFF6EFB10FF4B" box="[937,1160,196,221]" italics="true" pageId="43" pageNumber="44">Lyngbya tenuissima</emphasis>
(Nägeli) Hansgirg (1891: 346)
</taxonomicName>
. However, these were all pre-starting point names (i.e. pre-Gomont 1892, see McNeill 
<emphasis id="B962B3606C45FFAF04B7FF42FB47FE97" box="[1189,1247,232,257]" italics="true" pageId="43" pageNumber="44">et al.</emphasis>
2015). The taxon was validated post-starting point as 
<taxonomicName id="4C1614F16C45FFAF0209FEA6FB05FEB3" authority="(Nageli) Hansgirg ex Hansgirg 1892" authorityName="Hansgirg" authorityYear="1892" baseAuthorityName="Nageli" box="[539,1181,268,293]" class="Cyanophyceae" family="Oscillatoriaceae" genus="Lyngbya" kingdom="Bacteria" order="Nostocales" pageId="43" pageNumber="44" phylum="Cyanobacteria" rank="species" species="tenuissima">
<emphasis id="B962B3606C45FFAF0209FEA6FD62FEB3" box="[539,762,268,293]" italics="true" pageId="43" pageNumber="44">Lyngbya tenuissima</emphasis>
(Nägeli) Hansgirg ex Hansgirg 1892
</taxonomicName>
. When many of the thin simple 
<taxonomicName id="4C1614F16C45FFAF00C8FE9AFEE4FEDF" box="[218,380,304,329]" class="Cyanobacteriia" higherTaxonomySource="GBIF" kingdom="Bacteria" order="Oscillatoriales" pageId="43" pageNumber="44" phylum="Cyanobacteria" rank="order">Oscillatoriales</taxonomicName>
were transferred into 
<taxonomicName id="4C1614F16C45FFAF0267FE9AFB10FEDF" authority="(Komarek &amp; Anagnostidis 1988)" baseAuthorityName="Komarek &amp; Anagnostidis" baseAuthorityYear="1988" box="[629,1160,304,329]" class="Cyanophyceae" family="Oscillatoriaceae" genus="Leptolyngbya" kingdom="Bacteria" order="Nostocales" pageId="43" pageNumber="44" phylum="Cyanobacteria" rank="genus">
<emphasis id="B962B3606C45FFAF0267FE9AFC95FEDF" box="[629,781,304,329]" italics="true" pageId="43" pageNumber="44">Leptolyngbya</emphasis>
(Komárek &amp; Anagnostidis 1988)
</taxonomicName>
, 
<taxonomicName id="4C1614F16C45FFAF0486FE9AFEADFEFB" authority="Gardner (1927)" authorityName="Gardner" authorityYear="1927" class="Cyanophyceae" family="Scytonemataceae" genus="Plectonema" kingdom="Bacteria" order="Nostocales" pageId="43" pageNumber="44" phylum="Cyanobacteria" rank="species" species="tenuissimum">
<emphasis id="B962B3606C45FFAF0486FE9AFA33FEDF" box="[1172,1451,304,329]" italics="true" pageId="43" pageNumber="44">Plectonema tenuissimum</emphasis>
<bibRefCitation id="EF8712836C45FFAF009AFEFEFEADFEFB" author="Gardner, N. L." box="[136,309,340,365]" pageId="43" pageNumber="44" pagination="1 - 144" refId="ref32795" refString="Gardner, N. L. (1927) New Myxophyceae from Porto-Rico. Memoirs of the New York Botanical Garden 7: 1 - 144." type="journal article" year="1927">Gardner (1927)</bibRefCitation>
</taxonomicName>
was used as the basionym for 
<taxonomicName id="4C1614F16C45FFAF029FFEFEFA3EFEFB" authority="(Gardner) Komarek &amp; Anagnostidis (1988)" authorityName="Komarek &amp; Anagnostidis" authorityYear="1988" baseAuthorityName="Gardner" box="[653,1446,340,365]" class="Cyanophyceae" family="Oscillatoriaceae" genus="Leptolyngbya" kingdom="Bacteria" order="Nostocales" pageId="43" pageNumber="44" phylum="Cyanobacteria" rank="species" species="tenuissimum">
<emphasis id="B962B3606C45FFAF029FFEFEFC20FEFB" box="[653,952,340,365]" italics="true" pageId="43" pageNumber="44">Leptolyngbya tenuissimum</emphasis>
(Gardner) Komárek &amp; Anagnostidis (1988)
</taxonomicName>
, and consequently was occupied at the time of further revision, when Nägele’s taxon was given a new name, 
<taxonomicName id="4C1614F16C45FFAF0587FED2FE84FE23" class="Cyanophyceae" family="Oscillatoriaceae" genus="Leptolyngbya" kingdom="Bacteria" order="Nostocales" pageId="43" pageNumber="44" phylum="Cyanobacteria" rank="species" species="hansgirgiana">
<emphasis id="B962B3606C45FFAF0587FED2FE84FE23" italics="true" pageId="43" pageNumber="44">L. hansgirgiana</emphasis>
</taxonomicName>
. Our taxon is a close fit to the protologue in Kützing (0.7 μm wide, blue-green color only, terrestrial), but the description in 
<bibRefCitation id="EF8712836C45FFAF0144FE6AFD52FE4F" author="Komarek, J. &amp; Anagnostidis, K." box="[342,714,448,473]" pageId="43" pageNumber="44" refId="ref34263" refString="Komarek, J. &amp; Anagnostidis, K. (2005) Cyanoprokaryota II. In: Budel, B., Krienitz, L., Gartner, G. &amp; Schagerl, M. (Eds.) Susswasserflora von Mittleuropa 19 / 2. Elsevier / Spektrum, Munchen, 759 pp." type="book" year="2005">Komárek &amp; Anagnostidis (2005)</bibRefCitation>
has been broadened considerably based on the many subsequent records by multiple authors and is consequently not as apparent a fit. We hesitate to use this taxon with complicated, long history, broadly circumscribed morphology, and absence of sequence data or clear 
<typeStatus id="54ADD1D06C45FFAF0472FDA2FB5AFDB7" box="[1120,1218,520,545]" pageId="43" pageNumber="44" type="holotype">holotype</typeStatus>
material as the basis for the species name for Zehnder’s strain shown here to belong to 
<taxonomicName id="4C1614F16C45FFAF037FFD86FC7DFDD3" authorityName="Mai, Johansen et Pietrasiak" authorityYear="2018" box="[877,997,556,581]" class="Cyanobacteriia" family="Oculatellaceae" genus="Tildeniella" higherTaxonomySource="GBIF" kingdom="Bacteria" order="Synechococcales" pageId="43" pageNumber="44" phylum="Cyanobacteria" rank="genus">
<emphasis id="B962B3606C45FFAF037FFD86FC7DFDD3" box="[877,997,556,581]" italics="true" pageId="43" pageNumber="44">Tildeniella</emphasis>
</taxonomicName>
, and thus have created a new name.
</paragraph>
<caption id="DF693FFA6C44FFAE009AF8F2FA31F807" ID-DOI="http://doi.org/10.5281/zenodo.13704977" ID-Zenodo-Dep="13704977" httpUri="https://zenodo.org/record/13704977/files/figure.png" pageId="42" pageNumber="43" startId="42.[136,229,1880,1901]" targetBox="[151,1435,187,1852]" targetPageId="42" targetType="figure">
<paragraph id="8BA96F726C44FFAE009AF8F2FA31F807" blockId="42.[136,1451,1880,1937]" pageId="42" pageNumber="43">
<emphasis id="B962B3606C44FFAE009AF8F2FE91F8FB" bold="true" box="[136,265,1880,1901]" pageId="42" pageNumber="43">FIGURE 21.</emphasis>
<taxonomicName id="4C1614F16C44FFAE011DF8F2FE33F8FB" authorityName="Mai, Johansen et Bohunicka" authorityYear="2018" box="[271,427,1880,1901]" class="Cyanobacteriia" family="Oculatellaceae" genus="Tildeniella" higherTaxonomySource="GBIF" kingdom="Bacteria" order="Synechococcales" pageId="42" pageNumber="43" phylum="Cyanobacteria" rank="species" species="nuda">
<emphasis id="B962B3606C44FFAE011DF8F2FE33F8FB" box="[271,427,1880,1901]" italics="true" pageId="42" pageNumber="43">Tildeniella nuda</emphasis>
</taxonomicName>
. A. Filaments short, 
<taxonomicName id="4C1614F16C44FFAE0260F8F2FC93F8FB" authorityName="Lauterborn" authorityYear="1915" box="[626,779,1880,1901]" class="Cyanophyceae" family="Nostocaceae" genus="Pseudanabaena" kingdom="Bacteria" order="Nostocales" pageId="42" pageNumber="43" phylum="Cyanobacteria" rank="genus">
<emphasis id="B962B3606C44FFAE0260F8F2FC93F8FB" box="[626,779,1880,1901]" italics="true" pageId="42" pageNumber="43">Pseudanabaena</emphasis>
</taxonomicName>
-like, trichomes not or only slight constricted, connected by somewhat translucent cell wall; B–H. Cells sometimes distinctively elongated, bent or involuted (arrows). Scale bar 10μm in 1000X magnification.
</paragraph>
</caption>
<paragraph id="8BA96F726C45FFAF00AFFDFAFE80FD6F" blockId="43.[136,1452,160,761]" pageId="43" pageNumber="44">
<taxonomicName id="4C1614F16C45FFAF00AFFDFAFE8BFDFF" authorityName="Mai, Johansen et Bohunicka" authorityYear="2018" box="[189,275,592,617]" class="Cyanobacteriia" family="Oculatellaceae" genus="Tildeniella" higherTaxonomySource="GBIF" kingdom="Bacteria" order="Synechococcales" pageId="43" pageNumber="44" phylum="Cyanobacteria" rank="species" species="nuda">
<emphasis id="B962B3606C45FFAF00AFFDFAFE8BFDFF" box="[189,275,592,617]" italics="true" pageId="43" pageNumber="44">T. nuda</emphasis>
</taxonomicName>
is distinct from other species within the 
<taxonomicName id="4C1614F16C45FFAF02F8FDFAFC17FDFF" authorityName="Mai et Johansen" authorityYear="2018" box="[746,911,592,617]" class="Cyanobacteriia" family="Oculatellaceae" higherTaxonomySource="GBIF" kingdom="Bacteria" order="Synechococcales" pageId="43" pageNumber="44" phylum="Cyanobacteria" rank="family">Oculatellaceae</taxonomicName>
by its thin trichomes and high variation in cell length within trichomes. Molecularly, the species is closely related to 
<taxonomicName id="4C1614F16C45FFAF038DFDDEFB91FD1B" authorityName="Mai, Johansen et Pietrasiak" authorityYear="2018" box="[927,1033,628,653]" class="Cyanobacteriia" family="Oculatellaceae" genus="Tildeniella" higherTaxonomySource="GBIF" kingdom="Bacteria" order="Synechococcales" pageId="43" pageNumber="44" phylum="Cyanobacteria" rank="species" species="torsiva">
<emphasis id="B962B3606C45FFAF038DFDDEFB91FD1B" box="[927,1033,628,653]" italics="true" pageId="43" pageNumber="44">T. torsiva</emphasis>
</taxonomicName>
, with very high similarity in the 16S rRNA gene (99.1% identity, 
<tableCitation id="C6945AC96C45FFAF01DDFD32FDACFD27" box="[463,564,664,689]" captionStart="TABLE 13" captionStartId="43.[136,224,809,832]" captionText="TABLE 13. 16S rRNA genetic similarity among Tildeniella species." pageId="43" pageNumber="44">Table 13</tableCitation>
), and we were not able to compare the percent similiarty in the ITS structure due to sequence truncation of the 
<taxonomicName id="4C1614F16C45FFAF0215FD16FDC4FD43" authorityName="Mai, Johansen et Bohunicka" authorityYear="2018" box="[519,604,700,725]" class="Cyanobacteriia" family="Oculatellaceae" genus="Tildeniella" higherTaxonomySource="GBIF" kingdom="Bacteria" order="Synechococcales" pageId="43" pageNumber="44" phylum="Cyanobacteria" rank="species" species="nuda">
<emphasis id="B962B3606C45FFAF0215FD16FDC4FD43" box="[519,604,700,725]" italics="true" pageId="43" pageNumber="44">T. nuda</emphasis>
</taxonomicName>
reference strain. However, substantial taxonomic features separate the two species well.
</paragraph>
</subSubSection>
</treatment>
</document>