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<mods:title id="8DE63F9CABA3C92CDF5425F5A96222C0">Taxonomic notes on desmids from the Netherlands IV, with a description of another five new species</mods:title>
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<mods:namePart id="C112B707B4574713E0B7A51CC7804882">Van Westen, Marien C.</mods:namePart>
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<mods:affiliation id="D25C34297F0052F11C8F278FC8FC3E89">Podzolhamel 26, 9403 XC Assen, The Netherlands. &amp; mvanwesten @ home. nl; https: // orcid. org / 0000 - 0001 - 6905 - 9471</mods:affiliation>
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<mods:namePart id="A0CC05E19B200CFF4389A2E31217399F">Coesel, Peter F. M.</mods:namePart>
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<mods:affiliation id="045518AE10FB96F7236115121391FD76">Institute for Biodiversity and Ecosystem Dynamics, University of Amsterdam, Box 94240, 1090 GE Amsterdam, The Netherlands. &amp; p. f. m. coesel @ uva. nl; https: // orcid. org / 0000 - 0001 - 7709 - 4154</mods:affiliation>
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<mods:date id="AA55E1E6EF1C5AEE9F8D8F32CD8A5095">2021</mods:date>
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<treatment id="073487890E54FFF9FF70FA0EFF41FE1E" ID-DOI="http://doi.org/10.5281/zenodo.5562646" ID-GBIF-Taxon="188614043" ID-Zenodo-Dep="5562646" LSID="urn:lsid:plazi:treatment:073487890E54FFF9FF70FA0EFF41FE1E" httpUri="http://treatment.plazi.org/id/073487890E54FFF9FF70FA0EFF41FE1E" lastPageId="7" lastPageNumber="247" pageId="6" pageNumber="246">
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<taxonomicName id="489D4D1C0E54FFF8FF70FA0EFD3EFA62" authority="Van Westen &amp; Coesel" authorityName="Van Westen &amp; Coesel" authorityYear="2021" box="[136,681,1490,1517]" class="Conjugatophyceae" family="Desmidiaceae" genus="Cosmarium" kingdom="Plantae" order="Zygnematales" pageId="6" pageNumber="246" phylum="Charophyta" rank="species" species="regnesiforme" status="sp. nov.">
<emphasis id="BDE9EA8D0E54FFF8FF70FA0EFE39FA62" bold="true" box="[136,430,1490,1516]" italics="true" pageId="6" pageNumber="246">Cosmarium regnesiforme</emphasis>
Van Westen &amp; Coesel
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<emphasis id="BDE9EA8D0E54FFF8FD48FA0FFC8FFA62" box="[688,792,1491,1516]" italics="true" pageId="6" pageNumber="246">spec. nov</emphasis>
.
</taxonomicNameLabel>
(
<figureCitation id="17A62A1A0E54FFF8FCD7FA0EFCEAFA62" box="[815,893,1490,1516]" captionStart="FIGURES 18" captionStartId="1.[136,243,1628,1650]" captionTargetBox="[193,1407,212,1571]" captionTargetId="figure-19@1.[151,1436,187,1600]" captionTargetPageId="1" captionText="FIGURES 18. Drawings 1. Cosmarium grantii (from Eexterveld, province of Drenthe, the Netherlands). 2. C. palatiniforme. 3, 4. C. neonotabile (no 4 from Holmers, province of Drenthe, the Netherlands). 5. C. neocrenatum. 6. C. sphagnicola. 7. C. sphagnicoliforme (with zygospore). 8. C. regnesiforme." figureDoi="http://doi.org/10.5281/zenodo.5560453" httpUri="https://zenodo.org/record/5560453/files/figure.png" pageId="6" pageNumber="246">Figs. 8</figureCitation>
,
<figureCitation id="17A62A1A0E54FFF8FC72FA0EFC6BFA62" box="[906,1020,1490,1516]" captionStart="FIGURES 1823" captionStartId="3.[136,243,1339,1361]" captionTargetBox="[151,1435,190,1314]" captionTargetId="figure-20@3.[151,1435,190,1314]" captionTargetPageId="3" captionText="FIGURES 1823. LM photographs. 1820. Cosmarium palatiniforme (from Holmers). 2123. C. regnesiforme (21, 23 from Dwingelderveld, province of Drenthe, the Netherlands, 22 from type location). Scale bar = 10 µm" figureDoi="http://doi.org/10.5281/zenodo.5560461" httpUri="https://zenodo.org/record/5560461/files/figure.png" pageId="6" pageNumber="246">21, 22, 23</figureCitation>
,
<figureCitation id="17A62A1A0E54FFF8FBF0FA0EFBD8FA62" box="[1032,1103,1490,1516]" captionStart="FIGURES 3038" captionStartId="5.[136,243,1920,1942]" captionTargetBox="[151,1435,190,1895]" captionTargetId="figure-20@5.[151,1435,190,1895]" captionTargetPageId="5" captionText="FIGURES 3038. SEM photographs. 30. Cosmarium grantii (from Eexterveld). 31. C. neocrenatum (from Iceland). 32. C. neonotabile (from Holmers). 33. C. palatiniforme (from type location). 34. C. sphagnicola (from Eexterveld). 35. C. sphagnicoliforme (from type location). 36, 37. C. regnesiforme (from type location). 38. C. regnesi (Zeijen, province of Drenthe, the Netherlands). Figures 3033: Scale bar = 10 µm, Figures 3438: Scale bar = 5 µm" figureDoi="http://doi.org/10.5281/zenodo.5560465" httpUri="https://zenodo.org/record/5560465/files/figure.png" pageId="6" pageNumber="246">36, 37</figureCitation>
)
</heading>
</paragraph>
</subSubSection>
<subSubSection id="C78765140E54FFF9FF70FA2AFF41FE1E" lastPageId="7" lastPageNumber="247" pageId="6" pageNumber="246" type="diagnosis">
<paragraph id="8F22369F0E54FFF8FF70FA2AFF64F94A" blockId="6.[136,1452,1526,2093]" pageId="6" pageNumber="246">Diagnosis: Cells about as long as broad with a rather deep, widely V-shaped to U-shaped sinus. Semicells in frontal view triangular with deeply concave apex and downward bent apical angles. Semicell margin furnished with some six blunt dentations: two on either side of the apical indentation, usually two on each lateral side. Lateral parts of the semicell with a variable number (1-4) of scattered intramarginal dentations. Apical view elliptical-fusiform with on either side a blunt dentation near the poles. Semicells in lateral view subcircular. Chloroplast with a single, central pyrenoid.</paragraph>
<paragraph id="8F22369F0E54FFF8FF45F912FA0FF967" blockId="6.[136,1452,1526,2093]" box="[189,1432,1742,1769]" pageId="6" pageNumber="246">Dimensions: cell length 710 µm, breadth 7.510.5 µm, L/B =0.81.1, thickness 45 µm, isthmus 3.54.5 µm</paragraph>
<paragraph id="8F22369F0E54FFF8FF45F92FFC43F8DA" blockId="6.[136,1452,1526,2093]" pageId="6" pageNumber="246">
<materialsCitation id="3FF53CC20E54FFF8FF45F92FFC47F8DA" ID-GBIF-Occurrence="3382673304" collectingDate="2015-06-27" collectionCode="L" collectorName="Van Westen" country="Netherlands" latitude="52.834545" location="Hugo de Vries Lab" longLatPrecision="1" longitude="6.438517" pageId="6" pageNumber="246" specimenCount="1" stateProvince="Drenthe" typeStatus="holotype">
<collectorName id="226853490E54FFF8FF45F92FFF60F883" box="[189,247,1779,1805]" pageId="6" pageNumber="246">Type</collectorName>
:—
<collectingCountry id="F78A760F0E54FFF8FEE0F92FFDBFF882" box="[280,552,1778,1805]" name="Netherlands" pageId="6" pageNumber="246">THE NETHERLANDS</collectingCountry>
.
<collectingRegion id="4D59F87D0E54FFF8FDCBF92EFD05F882" box="[563,658,1778,1804]" country="Netherlands" name="Drenthe" pageId="6" pageNumber="246">Drenthe</collectingRegion>
: moorland pool
<collectorName id="226853490E54FFF8FCB3F92EFC04F882" box="[843,915,1778,1804]" pageId="6" pageNumber="246">Kliplo</collectorName>
near
<collectorName id="226853490E54FFF8FC2CF92EFBC4F882" box="[980,1107,1778,1804]" pageId="6" pageNumber="246">Dwingeloo</collectorName>
,
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,
<geoCoordinate id="EAA950580E54FFF8FAEFF92EFA31F883" box="[1303,1446,1778,1805]" degrees="6.438517" direction="east" orientation="longitude" pageId="6" pageNumber="246" precision="1" value="6.438517">6.438517° E</geoCoordinate>
, in
<taxonomicName id="489D4D1C0E54FFF8FF5DF8CAFE8CF8BE" authorityName="C.Linnaeus" authorityYear="1753" box="[165,283,1814,1840]" class="Sphagnopsida" family="Sphagnaceae" genus="Sphagnum" kingdom="Plantae" order="Sphagnales" pageId="6" pageNumber="246" phylum="Bryophyta" rank="genus">
<emphasis id="BDE9EA8D0E54FFF8FF5DF8CAFE8CF8BE" box="[165,283,1814,1840]" italics="true" pageId="6" pageNumber="246">Sphagnum</emphasis>
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squeezing, pH 6.9 conductivity 26 µS cm-
<superScript id="78E89BD70E54FFF8FD05F8CAFC92F8AA" attach="left" box="[765,773,1814,1828]" fontSize="6" pageId="6" pageNumber="246">1</superScript>
.
<collectorName id="226853490E54FFF8FCEBF8CBFC0CF8BF" box="[787,923,1815,1841]" pageId="6" pageNumber="246">Van Westen</collectorName>
,
<date id="FB23105F0E54FFF8FC5EF8CAFBACF8BF" box="[934,1083,1814,1841]" pageId="6" pageNumber="246" value="2015-06-27">
<collectingDate id="EB67E9B70E54FFF8FC5EF8CAFBACF8BF" box="[934,1083,1814,1841]" pageId="6" pageNumber="246" value="2015-06-27">27 June 2015</collectingDate>
</date>
(
<typeStatus id="5026883D0E54FFF8FBB2F8CAFB39F8BE" box="[1098,1198,1814,1840]" pageId="6" pageNumber="246" type="holotype">holotype</typeStatus>
<collectionCode id="E98CAE5A0E54FFF8FB4DF8CAFB5CF8BE" box="[1205,1227,1814,1840]" country="Netherlands" lsid="urn:lsid:biocol.org:col:15678" name="Nationaal Herbarium Nederland, Leiden University branch" pageId="6" pageNumber="246" type="Herbarium">L</collectionCode>
!
<location id="8A4260440E54FFF8FB2FF8CBFA3BF8BE" LSID="urn:lsid:plazi:treatment:073487890E54FFF9FF70FA0EFF41FE1E:8A4260440E54FFF8FB2FF8CBFA3BF8BE" box="[1239,1452,1814,1841]" country="Netherlands" latitude="52.834545" longLatPrecision="1" longitude="6.438517" name="Hugo de Vries Lab" pageId="6" pageNumber="246" stateProvince="Drenthe">Hugo de Vries Lab</location>
2021.05, preserved as a fixed natural sample and represented by our fig. 8)
</materialsCitation>
.
</paragraph>
<paragraph id="8F22369F0E54FFF9FF45F882FE96FF52" blockId="6.[136,1452,1526,2093]" lastBlockId="7.[136,1452,158,400]" lastPageId="7" lastPageNumber="247" pageId="6" pageNumber="246">
Differential diagnosis:—As its name indicates,
<taxonomicName id="489D4D1C0E54FFF8FD33F883FCE9F8F6" authorityName="Van Westen &amp; Coesel" authorityYear="2021" box="[715,894,1886,1913]" class="Conjugatophyceae" family="Desmidiaceae" genus="Cosmarium" kingdom="Plantae" order="Zygnematales" pageId="6" pageNumber="246" phylum="Charophyta" rank="species" species="regnesiforme">
<emphasis id="BDE9EA8D0E54FFF8FD33F883FCE9F8F6" box="[715,894,1886,1913]" italics="true" pageId="6" pageNumber="246">C. regnesiforme</emphasis>
</taxonomicName>
resembles
<taxonomicName id="489D4D1C0E54FFF8FC01F883FBFDF8F6" box="[1017,1130,1887,1913]" class="Conjugatophyceae" family="Desmidiaceae" genus="Cosmarium" kingdom="Plantae" order="Zygnematales" pageId="6" pageNumber="246" phylum="Charophyta" rank="species" species="regnesi">
<emphasis id="BDE9EA8D0E54FFF8FC01F883FBFDF8F6" box="[1017,1130,1887,1913]" italics="true" pageId="6" pageNumber="246">C. regnesi</emphasis>
</taxonomicName>
described by
<bibRefCitation id="EB0C4B6E0E54FFF8FAFBF882FA30F8F6" author="Reinsch, P." box="[1283,1447,1886,1912]" pageId="6" pageNumber="246" pagination="111 - 144" refId="ref4637" refString="Reinsch, P. (1867) De speciebus generibusque nonnulis novis ex algarum et fungorum classe. Abhandlungen der Senckenbergischen Naturforschenden Gesellschaft 6: 111 - 144." type="journal article" year="1867">Reinsch (1867</bibRefCitation>
, p. 116, pl. 22AIII: 15). Main difference is in the shape of the semicell: triangular instead of rectangular. Concomitant to that, apical angles are bent downward giving the impression of drooping shoulders. Although the species
<taxonomicName id="489D4D1C0E54FFF8FAC2F87BFA3CF84E" box="[1338,1451,1959,1985]" class="Conjugatophyceae" family="Desmidiaceae" genus="Cosmarium" kingdom="Plantae" order="Zygnematales" pageId="6" pageNumber="246" phylum="Charophyta" rank="species" species="regnesi">
<emphasis id="BDE9EA8D0E54FFF8FAC2F87BFA3CF84E" box="[1338,1451,1959,1985]" italics="true" pageId="6" pageNumber="246">C. regnesi</emphasis>
</taxonomicName>
is known for its multiformity, morphological variability mainly concerns its pattern of granulation (
<bibRefCitation id="EB0C4B6E0E54FFF8FAE8F816FF54F786" author="West, W. &amp; West, G. S." pageId="6" pageNumber="246" refId="ref4896" refString="West, W. &amp; West, G. S. (1908) A Monograph of the British Desmidiaceae. Vol. III. Ray Society, London, 274 pp. https: // doi. org / 10.5962 / bhl. title. 1619" type="book" year="1908">West &amp; West 1908</bibRefCitation>
;
<bibRefCitation id="EB0C4B6E0E54FFF8FF29F833FEF2F786" author="Forster, K." box="[209,357,2030,2057]" pageId="6" pageNumber="246" refId="ref4279" refString="Forster, K. (1982) Das Phytoplankton des Susswassers. 8. Teil, 1. Halfte. - Conjugatophyceae. E. Schweizerbart, Stuttgart." type="book" year="1982">Förster 1982</bibRefCitation>
). In view of the essentially different shape of our above described algal form we are of opinion that it deserves the status of a separate species. The find of a similar form on several locations in the Dutch province of
<collectingRegion id="4D59F87D0E55FFF9FF51FF42FE94FF36" box="[169,259,158,184]" country="Netherlands" name="Drenthe" pageId="7" pageNumber="247">Drenthe</collectingRegion>
and near Ambleside in the English Lake District renders it likely that it does not concern an incidental aberration.
</paragraph>
<paragraph id="8F22369F0E55FFF9FF45FF3AFF41FE1E" blockId="7.[136,1452,158,400]" pageId="7" pageNumber="247">
Morphological details:—With respect to the ornamentation pattern of
<taxonomicName id="489D4D1C0E55FFF9FC19FF3BFB00FE8E" authorityName="Van Westen &amp; Coesel" authorityYear="2021" box="[993,1175,230,257]" class="Conjugatophyceae" family="Desmidiaceae" genus="Cosmarium" kingdom="Plantae" order="Zygnematales" pageId="7" pageNumber="247" phylum="Charophyta" rank="species" species="regnesiforme">
<emphasis id="BDE9EA8D0E55FFF9FC19FF3BFB00FE8E" box="[993,1175,230,257]" italics="true" pageId="7" pageNumber="247">C. regnesiforme</emphasis>
</taxonomicName>
as revealed in scanning electron microscopy a remarkable dentate character of the bigger granules can be observed (figs 36, 37). As a similar feature is to be seen in SEM pictures of
<taxonomicName id="489D4D1C0E55FFF9FDA9FEF3FD54FEC6" box="[593,707,303,329]" class="Conjugatophyceae" family="Desmidiaceae" genus="Cosmarium" kingdom="Plantae" order="Zygnematales" pageId="7" pageNumber="247" phylum="Charophyta" rank="species" species="regnesi">
<emphasis id="BDE9EA8D0E55FFF9FDA9FEF3FD54FEC6" box="[593,707,303,329]" italics="true" pageId="7" pageNumber="247">C. regnesi</emphasis>
</taxonomicName>
(fig. 38) a common characteristic of the
<taxonomicName id="489D4D1C0E55FFF9FB6DFEF2FA90FEC6" box="[1173,1287,302,328]" class="Conjugatophyceae" family="Desmidiaceae" genus="Cosmarium" kingdom="Plantae" order="Zygnematales" pageId="7" pageNumber="247" phylum="Charophyta" rank="species" species="regnesi">
C.
<emphasis id="BDE9EA8D0E55FFF9FB4EFEF3FA90FEC6" box="[1206,1287,303,328]" italics="true" pageId="7" pageNumber="247">regnesi</emphasis>
</taxonomicName>
kinship group is likely. Although the dentations in question look like acutely shaped mucous extrusions they actually are minute spines.
</paragraph>
</subSubSection>
</treatment>
</document>