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<document ID-DOI="http://dx.doi.org/10.5091/plecevo.96359" ID-Pensoft-Pub="2032-3921-1-59" ID-Pensoft-UUID="A3301095CCAD56078E5F4CA25FE7E738" ModsDocID="2032-3921-156-1-59" checkinTime="1677749836928" checkinUser="pensoft" docAuthor="Bidault, Ehoarn, Boupoya, Archange, Ikabanga, Davy U., Nguimbit, Igor, Texier, Nicolas, Rutishauser, Rolf, Mesterhazy, Attila &amp; Stevart, Tariq" docDate="2023" docId="A804DF65A0E45160AEB68F86B40F88C3" docLanguage="en" docName="PlantEcolEvol 156(1): 59-84" docOrigin="Plant Ecology and Evolution 156 (1)" docPubDate="2023-03-01" docSource="http://dx.doi.org/10.5091/plecevo.96359" docTitle="Saxicolella nana Engl. (Engler 1926" docType="treatment" docVersion="1" id="A3301095CCAD56078E5F4CA25FE7E738" lastPageNumber="59" masterDocId="A3301095CCAD56078E5F4CA25FE7E738" masterDocTitle="Novitates Gabonenses 93: a fresh look at Podostemaceae in Gabon following recent inventories, with a new combination for Ledermanniella nicolasii" masterLastPageNumber="84" masterPageNumber="59" pageNumber="59" updateTime="1677749836928" updateUser="pensoft">
<mods:mods xmlns:mods="http://www.loc.gov/mods/v3">
<mods:titleInfo>
<mods:title>Novitates Gabonenses 93: a fresh look at Podostemaceae in Gabon following recent inventories, with a new combination for Ledermanniella nicolasii</mods:title>
</mods:titleInfo>
<mods:name type="personal">
<mods:role>
<mods:roleTerm>Author</mods:roleTerm>
</mods:role>
<mods:namePart>Bidault, Ehoarn</mods:namePart>
<mods:nameIdentifier type="ORCID">https://orcid.org/0000-0001-5029-8069</mods:nameIdentifier>
<mods:affiliation>Missouri Botanical Garden, Africa &amp; Madagascar Department, St. Louis, Missouri, USA &amp; Institut de Systematique, Evolution, et Biodiversite (ISYEB), Unite Mixte de Recherche 7205, Centre National de la Recherche Scientifique / Museum National d'Histoire Naturelle / Ecole Pratique des Hautes Etudes, Universite Pierre et Marie Curie, Sorbonne Universites, Paris, France</mods:affiliation>
<mods:nameIdentifier type="email">ehoarn.bidault@mobot.org</mods:nameIdentifier>
</mods:name>
<mods:name type="personal">
<mods:role>
<mods:roleTerm>Author</mods:roleTerm>
</mods:role>
<mods:namePart>Boupoya, Archange</mods:namePart>
<mods:nameIdentifier type="ORCID">https://orcid.org/0000-0002-8926-8737</mods:nameIdentifier>
<mods:affiliation>Institut de Recherche en Ecologie Tropicale (IRET), Libreville, Gabon &amp; Herbier National du Gabon, Libreville, Gabon</mods:affiliation>
</mods:name>
<mods:name type="personal">
<mods:role>
<mods:roleTerm>Author</mods:roleTerm>
</mods:role>
<mods:namePart>Ikabanga, Davy U.</mods:namePart>
<mods:affiliation>Laboratoire d'Ecophysiologie et de Biodiversite Vegetale, Departement de Biologie, Faculte des Sciences, Universite des Sciences et Techniques de Masuku (USTM), Franceville, Gabon</mods:affiliation>
</mods:name>
<mods:name type="personal">
<mods:role>
<mods:roleTerm>Author</mods:roleTerm>
</mods:role>
<mods:namePart>Nguimbit, Igor</mods:namePart>
<mods:affiliation>Laboratoire d'Ecophysiologie et de Biodiversite Vegetale, Departement de Biologie, Faculte des Sciences, Universite des Sciences et Techniques de Masuku (USTM), Franceville, Gabon</mods:affiliation>
</mods:name>
<mods:name type="personal">
<mods:role>
<mods:roleTerm>Author</mods:roleTerm>
</mods:role>
<mods:namePart>Texier, Nicolas</mods:namePart>
<mods:nameIdentifier type="ORCID">https://orcid.org/0000-0002-4045-992X</mods:nameIdentifier>
<mods:affiliation>Missouri Botanical Garden, Africa &amp; Madagascar Department, St. Louis, Missouri, USA &amp; Evolutionary Biology and Ecology Unit, Faculte des Sciences, Universite Libre de Bruxelles, Brussels, Belgium</mods:affiliation>
</mods:name>
<mods:name type="personal">
<mods:role>
<mods:roleTerm>Author</mods:roleTerm>
</mods:role>
<mods:namePart>Rutishauser, Rolf</mods:namePart>
<mods:affiliation>Herbarium et Bibliotheque de Botanique africaine, Universite Libre de Bruxelles, Brussels, Belgium</mods:affiliation>
</mods:name>
<mods:name type="personal">
<mods:role>
<mods:roleTerm>Author</mods:roleTerm>
</mods:role>
<mods:namePart>Mesterhazy, Attila</mods:namePart>
<mods:nameIdentifier type="ORCID">https://orcid.org/0000-0001-7952-5990</mods:nameIdentifier>
<mods:affiliation>Department of Systematic and Evolutionary Botany, University of Zurich, Switzerland</mods:affiliation>
</mods:name>
<mods:name type="personal">
<mods:role>
<mods:roleTerm>Author</mods:roleTerm>
</mods:role>
<mods:namePart>Stevart, Tariq</mods:namePart>
<mods:nameIdentifier type="ORCID">https://orcid.org/0000-0002-6212-0361</mods:nameIdentifier>
<mods:affiliation>Missouri Botanical Garden, Africa &amp; Madagascar Department, St. Louis, Missouri, USA &amp; Evolutionary Biology and Ecology Unit, Faculte des Sciences, Universite Libre de Bruxelles, Brussels, Belgium &amp; Centre for Ecological Research, Wetland Ecology Research Group, Debrecen, Hungary</mods:affiliation>
</mods:name>
<mods:typeOfResource>text</mods:typeOfResource>
<mods:relatedItem type="host">
<mods:titleInfo>
<mods:title>Plant Ecology and Evolution</mods:title>
</mods:titleInfo>
<mods:part>
<mods:date>2023</mods:date>
<mods:detail type="pubDate">
<mods:number>2023-03-01</mods:number>
</mods:detail>
<mods:detail type="volume">
<mods:number>156</mods:number>
</mods:detail>
<mods:detail type="issue">
<mods:number>1</mods:number>
</mods:detail>
<mods:extent unit="page">
<mods:start>59</mods:start>
<mods:end>84</mods:end>
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<mods:location>
<mods:url>http://dx.doi.org/10.5091/plecevo.96359</mods:url>
</mods:location>
<mods:classification>journal article</mods:classification>
<mods:identifier type="DOI">http://dx.doi.org/10.5091/plecevo.96359</mods:identifier>
<mods:identifier type="Pensoft-Pub">2032-3921-1-59</mods:identifier>
<mods:identifier type="Pensoft-UUID">A3301095CCAD56078E5F4CA25FE7E738</mods:identifier>
</mods:mods>
<treatment LSID="urn:lsid:plazi:treatment:A804DF65A0E45160AEB68F86B40F88C3" httpUri="http://treatment.plazi.org/id/A804DF65A0E45160AEB68F86B40F88C3" lastPageNumber="59" pageId="0" pageNumber="59">
<subSubSection pageId="0" pageNumber="59" type="nomenclature">
<paragraph pageId="0" pageNumber="59">
<taxonomicName ID-CoL="6Y2RD" ID-ENA="1155304" LSID="A804DF65-A0E4-5160-AEB6-8F86B40F88C3" authority="Engl. (Engler 1926: 456)" authorityName="Engl. (Engler" authorityYear="1926" class="Magnoliopsida" family="Podostemaceae" genus="Saxicolella" higherTaxonomySource="CoL" kingdom="Plantae" lsidName="Saxicolella nana" order="Malpighiales" pageId="0" pageNumber="59" phylum="Tracheophyta" rank="species" species="nana">Saxicolella nana Engl. (Engler 1926: 456)</taxonomicName>
</paragraph>
</subSubSection>
<subSubSection pageId="0" pageNumber="59" type="description">
<paragraph pageId="0" pageNumber="59">
<figureCitation captionStart="Figure 7" captionStartId="F7" captionText="Figure 7. Distribution maps of Podostemaceae in Gabon. A. Ledermanniella pusilla (red diamonds), L. tenuifolia (grey circle). B. Ledermanniella pygmaea (grey circles), Macropodiella heteromorpha (red diamonds). C. Macropodiella hallaei (grey circles), Saxicolella nana (red diamonds). D. Tristicha trifaria (grey circles)." figureDoi="10.5091/plecevo.96359.figure7" httpUri="https://binary.pensoft.net/fig/816317" pageId="0" pageNumber="59">Figs 7C</figureCitation>
<figureCitation captionStart="Figure 8" captionStartId="F8" captionText="Figure 8. Photographs illustrating a selection of species treated in this paper. A, B, C. Ledermanniella schlechteri (A: Texier et al. 2335; B: Texier et al. 2274; C: Texier et al. 2250). D, E. Ledermanniella tenuifolia (D: Boupoya et al. 2417; E: Boupoya et al. 2426). F, G. Macropodiella hallaei (Texier et al. 2249). H, I. Saxicolella nana (Boupoya et al. 1952). Photographs: Nicolas Texier (A-C, F, G), Archange Boupoya (D, E, H, I)." figureDoi="10.5091/plecevo.96359.figure8" httpUri="https://binary.pensoft.net/fig/816318" pageId="0" pageNumber="59">, 8H, I</figureCitation>
</paragraph>
</subSubSection>
<subSubSection pageId="0" pageNumber="59" type="materials_examined">
<paragraph pageId="0" pageNumber="59">
<typeStatus>Type</typeStatus>
.
</paragraph>
<paragraph pageId="0" pageNumber="59">
<materialsCitation collectingDate="1914-01" collectorName="von Jaunde" country="CAMEROON" elevation="640" latitude="3.5083334" location="Nyong river" longLatPrecision="21" longitude="11.4925" municipality="Yaounde" specimenCount="1" typeStatus="holotype">
<collectingCountry name="Cameroon">CAMEROON</collectingCountry>
•
<location LSID="urn:lsid:plazi:treatment:A804DF65A0E45160AEB68F86B40F88C3:01B4C957C570558BBEFAB958EBABB0E5" country="CAMEROON" latitude="3.5083334" longLatPrecision="21" longitude="11.4925" municipality="Yaounde" name="Nyong river">Nyong river</location>
, south of
<normalizedToken originalValue="Yaoundé">
<collectingMunicipality>Yaounde</collectingMunicipality>
</normalizedToken>
[&quot;Auf
<normalizedToken originalValue="Felsblöcken">Felsbloecken</normalizedToken>
im Nyong,
<normalizedToken originalValue="südlich">suedlich</normalizedToken>
<collectorName>von Jaunde</collectorName>
&quot;];
<collectingDate value="1914-01">Jan. 1914</collectingDate>
; [
<geoCoordinate degrees="3" direction="north" minutes="30" orientation="latitude" precision="15" seconds="30" value="3.5083334">
3°30
<normalizedToken originalValue="’30”">'30&quot;</normalizedToken>
N
</geoCoordinate>
,
<geoCoordinate degrees="11" direction="east" minutes="29" orientation="longitude" precision="15" seconds="33" value="11.4925">
11°29
<normalizedToken originalValue="’33”">'33&quot;</normalizedToken>
E
</geoCoordinate>
];
<quantity metricMagnitude="2" metricUnit="m" metricValue="6.4" unit="m" value="640.0">
<elevation metricMagnitude="2" metricUnit="m" metricValue="6.4" unit="m" value="640.0">640 m</elevation>
</quantity>
; fl., fr.;
<emphasis italics="true" pageId="0" pageNumber="59">Mildbraed 7749a</emphasis>
;
<typeStatus>holotype</typeStatus>
: B [B100294988]; isotype: U [U1518023]
</materialsCitation>
.
</paragraph>
</subSubSection>
<subSubSection pageId="0" pageNumber="59" type="distribution">
<paragraph pageId="0" pageNumber="59">Distribution.</paragraph>
<paragraph pageId="0" pageNumber="59">
Cameroon, Gabon. Before 2018, this species was only known from two collections made at Mbalmayo, Cameroon, in the Nyong river. Johannes Mildbraed collected the first specimen in 1914 (
<emphasis italics="true" pageId="0" pageNumber="59">Mildbraed 7749a</emphasis>
), and in 2007, a second specimen (
<emphasis italics="true" pageId="0" pageNumber="59">Kato et al. CMR-129</emphasis>
) was discovered at the type locality. Since 2018, the authors and colleagues collected
<taxonomicName lsidName="S. nana" pageId="0" pageNumber="59" rank="species" species="nana">
<emphasis italics="true" pageId="0" pageNumber="59">S. nana</emphasis>
</taxonomicName>
nine times in Gabon, where it is now known from the
<normalizedToken originalValue="Ogooué">Ogooue</normalizedToken>
, Ivindo, and Okano rivers. It is expected to occur in other rivers in Gabon, as well as in Equatorial Guinea (since it occurs in Cameroon as well as Gabon) and the Republic of the Congo, since it has been collected at its border with Gabon.
</paragraph>
</subSubSection>
<subSubSection pageId="0" pageNumber="59" type="habitat">
<paragraph pageId="0" pageNumber="59">Habitat and ecology.</paragraph>
<paragraph pageId="0" pageNumber="59">
Falls and rapids in rivers from ca 50 to 900 m wide, 160-650 m in elevation. This species is widely distributed, but appears to be rare when encountered. In Gabon it is apparently restricted to micro-habitats submitted to slow-flowing water. It seems to form small, monospecific patches. In
<normalizedToken originalValue="Booué">Booue</normalizedToken>
, it was found in the vicinity of
<taxonomicName class="Magnoliopsida" family="Podostemaceae" kingdom="Plantae" lsidName="L. pusilla" order="Malpighiales" pageId="0" pageNumber="59" phylum="Tracheophyta" rank="species" species="pusilla">
<emphasis italics="true" pageId="0" pageNumber="59">L. pusilla</emphasis>
</taxonomicName>
, and may share the same micro-habitat. In Gabon, flowers and fruits were collected in February, July, and August, in Cameroon, in January and February.
</paragraph>
</subSubSection>
<subSubSection pageId="0" pageNumber="59" type="notes">
<paragraph pageId="0" pageNumber="59">Notes.</paragraph>
<paragraph pageId="0" pageNumber="59">
<bibRefCitation DOI="https://doi.org/10.1007/s12225-022-10019-2" author="Cheek, M" journalOrPublisher="Kew Bulletin" pageId="0" pageNumber="59" pagination="403 - 433" refId="B13" refString="Cheek, M, Molmou, D, Magassouba, S, Ghogue, J-P, 2022. Taxonomic monograph of Saxicolella (Podostemaceae), African waterfall plants highly threatened by hydro-electric projects, with five new species. Kew Bulletin 77: 403 - 433, DOI: https://doi.org/10.1007/s12225-022-10019-2" title="Taxonomic monograph of Saxicolella (Podostemaceae), African waterfall plants highly threatened by hydro-electric projects, with five new species." url="https://doi.org/10.1007/s12225-022-10019-2" volume="77" year="2022">Cheek et al. (2022)</bibRefCitation>
, in their taxonomic monograph of
<taxonomicName class="Magnoliopsida" family="Podostemaceae" genus="Saxicolella" higherTaxonomySource="CoL" kingdom="Plantae" lsidName="Saxicolella" order="Malpighiales" pageId="0" pageNumber="59" phylum="Tracheophyta" rank="genus">
<emphasis italics="true" pageId="0" pageNumber="59">Saxicolella</emphasis>
</taxonomicName>
, mention that the recent material collected by the authors of the present study and colleagues most likely represent a new, yet undescribed species that they mention as an unplaced &quot;sp. A&quot;, being morphologically close to
<taxonomicName lsidName="S. nana" pageId="0" pageNumber="59" rank="species" species="nana">
<emphasis italics="true" pageId="0" pageNumber="59">S. nana</emphasis>
</taxonomicName>
(subg.
<taxonomicName authority="Saxicolella" class="Magnoliopsida" family="Podostemaceae" genus="Saxicolella" higherTaxonomySource="CoL" kingdom="Plantae" lsidName="Saxicolella (Saxicolella)" order="Malpighiales" pageId="0" pageNumber="59" phylum="Tracheophyta" rank="subGenus" subGenus="Saxicolella">Saxicolella Saxicolella</taxonomicName>
). The preliminary description provided by
<bibRefCitation DOI="https://doi.org/10.1007/s12225-022-10019-2" author="Cheek, M" journalOrPublisher="Kew Bulletin" pageId="0" pageNumber="59" pagination="403 - 433" refId="B13" refString="Cheek, M, Molmou, D, Magassouba, S, Ghogue, J-P, 2022. Taxonomic monograph of Saxicolella (Podostemaceae), African waterfall plants highly threatened by hydro-electric projects, with five new species. Kew Bulletin 77: 403 - 433, DOI: https://doi.org/10.1007/s12225-022-10019-2" title="Taxonomic monograph of Saxicolella (Podostemaceae), African waterfall plants highly threatened by hydro-electric projects, with five new species." url="https://doi.org/10.1007/s12225-022-10019-2" volume="77" year="2022">Cheek et al. (2022)</bibRefCitation>
mentions that it would differ from
<taxonomicName lsidName="S. nana" pageId="0" pageNumber="59" rank="species" species="nana">
<emphasis italics="true" pageId="0" pageNumber="59">S. nana</emphasis>
</taxonomicName>
by having roots long and ribbon-like with the shoots lacking visible stems, and arising along the margins of the root in rows (vs disc-like, crustose, the shoots with visible stems, arising from the centre of the root in a cluster); leaves entire, linear, and not trifid from a point ca 1.5 mm from the base; the ovary sessile (the staminal filament inserted at its base), not with a distinct gynophore; fruit 8-ribbed (not 6-ribbed). However, as stated by the authors, they did not have access to the Gabonese material, and these observations were made from the associated pictures of living plants made in the field. After close examination of the Gabonese material against the characters mentioned by
<bibRefCitation DOI="https://doi.org/10.1007/s12225-022-10019-2" author="Cheek, M" journalOrPublisher="Kew Bulletin" pageId="0" pageNumber="59" pagination="403 - 433" refId="B13" refString="Cheek, M, Molmou, D, Magassouba, S, Ghogue, J-P, 2022. Taxonomic monograph of Saxicolella (Podostemaceae), African waterfall plants highly threatened by hydro-electric projects, with five new species. Kew Bulletin 77: 403 - 433, DOI: https://doi.org/10.1007/s12225-022-10019-2" title="Taxonomic monograph of Saxicolella (Podostemaceae), African waterfall plants highly threatened by hydro-electric projects, with five new species." url="https://doi.org/10.1007/s12225-022-10019-2" volume="77" year="2022">Cheek et al. (2022)</bibRefCitation>
, as well as the collection
<emphasis italics="true" pageId="0" pageNumber="59">Kato et al. CMR-129</emphasis>
from the type locality of
<taxonomicName lsidName="S. nana" pageId="0" pageNumber="59" rank="species" species="nana">
<emphasis italics="true" pageId="0" pageNumber="59">S. nana</emphasis>
</taxonomicName>
and widely accepted as belonging to this species, we noted that both the Gabonese and Cameroonian material showed all roots as not crustose, but ribbon-like, 0.5 to 1.5 mm wide. Branching root-ribbons may produce a carpet-like
<normalizedToken originalValue="“crust”">&quot;crust&quot;</normalizedToken>
by creeping over each other. In addition, the drawing 37C by Pohl in
<bibRefCitation author="Engler, A" journalOrPublisher="Botanische Jahrbuecher fuer Systematik, Pflanzengeschichte und Pflanzengeographie" pageId="0" pageNumber="59" refId="B29" refString="Engler, A, 1930. Podostemonaceae. Die Natuerlichen Pflanzenfamilien 18a: 3-68." title="Podostemonaceae. Die Natuerlichen Pflanzenfamilien 18 a: 3 - 68." year="1930">Engler (1930</bibRefCitation>
: 48), displays a ribbon-like root, ca 1 mm wide, inconsistent with his own description of the species. Unfortunately,
<normalizedToken originalValue="Cusset’s">Cusset's</normalizedToken>
description in Flore du Cameroun (
<bibRefCitation author="Cusset, C" journalOrPublisher="Flore du Cameroun" pageId="0" pageNumber="59" pagination="51 - 101" refId="B21" refString="Cusset, C, 1987. Podostemaceae - Tristichaceae. Flore du Cameroun 30: 51 - 101" title="Podostemaceae - Tristichaceae." volume="30" year="1987">Cusset 1987</bibRefCitation>
), solely based on the type material, is not very helpful for this particular character either: &quot;partie basale
<normalizedToken originalValue="thalloïde">thalloide</normalizedToken>
<normalizedToken originalValue="foliacée">foliacee</normalizedToken>
,
<normalizedToken originalValue="profondément">profondement</normalizedToken>
<normalizedToken originalValue="divisée’’">divisee''</normalizedToken>
is a rather generic statement that could either correspond to crustose root or ribbon-like root. We believe it is best to consider
<taxonomicName lsidName="S. nana" pageId="0" pageNumber="59" rank="species" species="nana">
<emphasis italics="true" pageId="0" pageNumber="59">S. nana</emphasis>
</taxonomicName>
as having ribbon-like roots that may produce a carpet-like crust by creeping over each other (hence
<normalizedToken originalValue="Engler’s">Engler's</normalizedToken>
probable mistake). Regarding shoots arising along the margins of the root in rows (vs arising from the centre of the root in a cluster), our examination of
<emphasis italics="true" pageId="0" pageNumber="59">Kato et al. CMR-129</emphasis>
showed all roots carrying short-shoots along the flanks or margins, not at the centre. Again, the Gabonese material shows a similar feature. Unlike stated by
<bibRefCitation DOI="https://doi.org/10.1007/s12225-022-10019-2" author="Cheek, M" journalOrPublisher="Kew Bulletin" pageId="0" pageNumber="59" pagination="403 - 433" refId="B13" refString="Cheek, M, Molmou, D, Magassouba, S, Ghogue, J-P, 2022. Taxonomic monograph of Saxicolella (Podostemaceae), African waterfall plants highly threatened by hydro-electric projects, with five new species. Kew Bulletin 77: 403 - 433, DOI: https://doi.org/10.1007/s12225-022-10019-2" title="Taxonomic monograph of Saxicolella (Podostemaceae), African waterfall plants highly threatened by hydro-electric projects, with five new species." url="https://doi.org/10.1007/s12225-022-10019-2" volume="77" year="2022">Cheek et al. (2022)</bibRefCitation>
,
<taxonomicName authorityName="Engl. (Engler" authorityYear="1926" class="Magnoliopsida" family="Podostemaceae" genus="Saxicolella" higherTaxonomySource="CoL" kingdom="Plantae" lsidName="Saxicolella nana" order="Malpighiales" pageId="0" pageNumber="59" phylum="Tracheophyta" rank="species" species="nana">
<emphasis italics="true" pageId="0" pageNumber="59">Saxicolella nana</emphasis>
</taxonomicName>
is described by
<bibRefCitation author="Cusset, C" journalOrPublisher="Flore du Cameroun" pageId="0" pageNumber="59" pagination="51 - 101" refId="B21" refString="Cusset, C, 1987. Podostemaceae - Tristichaceae. Flore du Cameroun 30: 51 - 101" title="Podostemaceae - Tristichaceae." volume="30" year="1987">Cusset (1987)</bibRefCitation>
as having stemless or sub-stemmed shoots (&quot;pousses acaules ou subacaules&quot;). The recently collected Gabonese material is also consistent with this description. Leaves of the Gabonese material were mentioned as entire and linear by
<bibRefCitation DOI="https://doi.org/10.1007/s12225-022-10019-2" author="Cheek, M" journalOrPublisher="Kew Bulletin" pageId="0" pageNumber="59" pagination="403 - 433" refId="B13" refString="Cheek, M, Molmou, D, Magassouba, S, Ghogue, J-P, 2022. Taxonomic monograph of Saxicolella (Podostemaceae), African waterfall plants highly threatened by hydro-electric projects, with five new species. Kew Bulletin 77: 403 - 433, DOI: https://doi.org/10.1007/s12225-022-10019-2" title="Taxonomic monograph of Saxicolella (Podostemaceae), African waterfall plants highly threatened by hydro-electric projects, with five new species." url="https://doi.org/10.1007/s12225-022-10019-2" volume="77" year="2022">Cheek et al. (2022)</bibRefCitation>
(vs trifid for
<taxonomicName lsidName="S. nana" pageId="0" pageNumber="59" rank="species" species="nana">
<emphasis italics="true" pageId="0" pageNumber="59">S. nana</emphasis>
</taxonomicName>
). Close observation of the material revealed the presence of bifid leaves, and observations on
<emphasis italics="true" pageId="0" pageNumber="59">Kato et al. CMR-129</emphasis>
showed not only trifid leaves, but also bifid and linear ones. We believe this character can be variable, and a clear overlap suggests it may not be possible to differentiate the Gabonese material from the Cameroonian based on this feature. In addition, the ovary was mentioned as sessile on the Gabonese material by the authors of the monograph, but close observation shows that this material has a distinct gynophore, with the filament not inserted at the base of the ovary. Finally,
<bibRefCitation DOI="https://doi.org/10.1007/s12225-022-10019-2" author="Cheek, M" journalOrPublisher="Kew Bulletin" pageId="0" pageNumber="59" pagination="403 - 433" refId="B13" refString="Cheek, M, Molmou, D, Magassouba, S, Ghogue, J-P, 2022. Taxonomic monograph of Saxicolella (Podostemaceae), African waterfall plants highly threatened by hydro-electric projects, with five new species. Kew Bulletin 77: 403 - 433, DOI: https://doi.org/10.1007/s12225-022-10019-2" title="Taxonomic monograph of Saxicolella (Podostemaceae), African waterfall plants highly threatened by hydro-electric projects, with five new species." url="https://doi.org/10.1007/s12225-022-10019-2" volume="77" year="2022">Cheek et al. (2022)</bibRefCitation>
mentioned the Gabonese material as having 8-ribbed fruits, versus 6-ribbed for
<taxonomicName lsidName="S. nana" pageId="0" pageNumber="59" rank="species" species="nana">
<emphasis italics="true" pageId="0" pageNumber="59">S. nana</emphasis>
</taxonomicName>
. The Gabonese collections indeed show eight ribs, including two commissural, but it is also the case for the collection
<emphasis italics="true" pageId="0" pageNumber="59">Kato et al. CMR-129</emphasis>
from the type locality. The original description by
<bibRefCitation author="Engler, A" journalOrPublisher="Botanische Jahrbuecher fuer Systematik, Pflanzengeschichte und Pflanzengeographie" pageId="0" pageNumber="59" pagination="451 - 467" refId="B28" refString="Engler, A, 1926. Beitraege zur Flora von Afrika. LII. Podostemonaceae africanae. IV. Botanische Jahrbuecher fuer Systematik, Pflanzengeschichte und Pflanzengeographie 60 (5): 451 - 467" title="Beitraege zur Flora von Afrika. LII. Podostemonaceae africanae. IV." volume="60" year="1926">Engler (1926)</bibRefCitation>
mentioned
<normalizedToken originalValue="“6-nervium”">&quot;6-nervium&quot;</normalizedToken>
in Latin, but
<normalizedToken originalValue="Pohl’s">Pohl's</normalizedToken>
drawings (
<bibRefCitation author="Engler, A" journalOrPublisher="Botanische Jahrbuecher fuer Systematik, Pflanzengeschichte und Pflanzengeographie" pageId="0" pageNumber="59" refId="B29" refString="Engler, A, 1930. Podostemonaceae. Die Natuerlichen Pflanzenfamilien 18a: 3-68." title="Podostemonaceae. Die Natuerlichen Pflanzenfamilien 18 a: 3 - 68." year="1930">Engler 1930</bibRefCitation>
: 48) show an ovary with six ribs in addition to two commissural ribs that are rather drawn as depressions. In addition,
<normalizedToken originalValue="“ribs”">&quot;ribs&quot;</normalizedToken>
on ovaries at anthesis do not appear to be prominent, but rather as darker lines, and commissural ones are indistinct from non-commissural at this stage, whereas, as suggested by
<normalizedToken originalValue="Pohl’s">Pohl's</normalizedToken>
drawings, the non-commissural ribs become prominent on the fruit, unlike the commissural two. We believe Engler was referring only to the six non-commissural ribs when writing
<normalizedToken originalValue="“6-nervium”">&quot;6-nervium&quot;</normalizedToken>
. Cusset, in Flore du Cameroun, as well as
<bibRefCitation author="Kato, M" journalOrPublisher="Bulletin du Jardin botanique de l'Etat a Bruxelles" pageId="0" pageNumber="59" refId="B37" refString="Kato, M, 2013. The Illustrated Book of Plant Systematics in Color: Podostemaceae of the World. Hokuryukan, Tokyo, 1-308." title="The Illustrated Book of Plant Systematics in Color: Podostemaceae of the World. Hokuryukan, Tokyo, 1 - 308." year="2013">Kato (2013)</bibRefCitation>
state that
<taxonomicName lsidName="S. nana" pageId="0" pageNumber="59" rank="species" species="nana">
<emphasis italics="true" pageId="0" pageNumber="59">S. nana</emphasis>
</taxonomicName>
has eight ribs. As a consequence, the recently collected Gabonese material is consistent with
<normalizedToken originalValue="Cusset’s">Cusset's</normalizedToken>
updated description of
<taxonomicName lsidName="S. nana" pageId="0" pageNumber="59" rank="species" species="nana">
<emphasis italics="true" pageId="0" pageNumber="59">S. nana</emphasis>
</taxonomicName>
, as having eight ribs (including the commissural ones). For all these reasons, we choose to consider the Gabonese material as a member of this species, and not as a separate, undescribed species.
</paragraph>
</subSubSection>
</treatment>
</document>
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