View source for Didymodon nicholsonii

{{Treatment/ID
|accepted_name=Didymodon nicholsonii
|accepted_authority=Culmann
|publications={{Treatment/Publication
|title=Rev. Bryol.
|place=34: 100, figs. 1–9. 1907 (as nicholsoni),
}}
|basionyms=
|synonyms={{Treatment/ID/Synonym
|name=Didymodon vinealis var. nicholsonii
|authority=(Culmann) R. H. Zander
}}
|hierarchy=Pottiaceae;Pottiaceae subfam. Barbuloideae;Didymodon;Didymodon nicholsonii
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Pottiaceae]]</div><div class="higher-taxon"><small>subfamily</small>[[Pottiaceae subfam. Barbuloideae]]</div><div class="higher-taxon"><small>genus</small>[[Didymodon]]</div><div class="higher-taxon"><small>species</small>[[Didymodon nicholsonii]]</div></div>
|volume=Volume 27
|mention_page=page 542, 554, 560, 561
|treatment_page=page 553
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Plants </b>green to dark green, usually with a reddish cast. <b>Stems</b> to 2 cm, central strand present. <b>Stem</b> leaves appressed to weakly spreading when dry, spreading and not keeled when moist, monomorphic, long-ovate or occasionally ovate-lanceolate, rarely lanceolate, grooved adaxially along the costa, especially near leaf apex, to 3.5 mm, base scarcely differentiated to ovate or oblong in shape, margins narrowly recurved in proximal 3/4 of leaf, entire, apex acute to blunt, not fragile; costa percurrent or ending before the apex, not strongly spurred, not much widened or tapering, lacking an adaxial pad of cells, adaxial costal cells quadrate to short-rectangular, ca. 6 cells wide at mid leaf, guide cells in 1(–2) layers; basal laminal cells very weakly differentiated medially, walls thin to weakly thickened, quadrate to short-rectangular, not perforated; distal laminal cells 7–9 µm wide, 1:1, nearly smooth or papillae simple or 2-fid, 2–3 per lumen, lumens rounded-quadrate, walls thickened, weakly convex on both sides of lamina, 2-stratose in distal leaf half or occasionally only in patches or very rarely 1-stratose, cells of distal leaf margins 2-stratose or occasionally entire leaf 2-stratose distally. <b>Specialized</b> asexual reproduction absent. <b>Seta</b> ca. 1.2 cm. <b>Capsule</b> 1.5–2.1 mm; peristome teeth 32, linear, twisted 1/2 times to once, to 1000 µm. <b>Spores</b> 11–13 µm. <b>Distal</b> laminal KOH reaction light to dark red-brown, occasionally deep red-orange.</span><!--

-->{{Treatment/Body
|phenology=Capsules mature spring–summer.
|habitat=Wet rocks, quartzite, wet silty sand, stream bank, canyon walls, streamside, chaparral
|elevation=low to high elevations (50-1900 m)
|distribution=B.C.;Calif.;Mont.;Nev.;Oreg.;Utah;Europe;Asia (Afghanistan).
|discussion=<p><i>Didymodon nicholsonii</i> intergrades somewhat with <i>D. vinealis</i> but the ovate-lanceolate leaves are distinctive as is the tendency to a partially or completely 2-stratose distal lamina. It may be confused with <i>D. rigidulus</i> but has a broader leaf apex, the costa commonly ending before the apex, a deep apical groove over the costa, and 2-stratose distal marginal cells often in a narrow band. The western species <i>Grimmia</i> cinclidontea Müller Hal. is similar and grows in similar habitats, but is autoicous, has smooth leaf cells and a homogeneous costal section. S. Flowers’s (1973) illustration of <i>D. rigidulus</i> is actually of <i>D. nicholsonii</i>.</p>
|tables=
|references=
}}<!--

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-->{{#Taxon:
name=Didymodon nicholsonii
|author=
|authority=Culmann
|rank=species
|parent rank=genus
|synonyms=Didymodon vinealis var. nicholsonii
|basionyms=
|family=Pottiaceae
|phenology=Capsules mature spring–summer.
|habitat=Wet rocks, quartzite, wet silty sand, stream bank, canyon walls, streamside, chaparral
|elevation=low to high elevations (50-1900 m)
|distribution=B.C.;Calif.;Mont.;Nev.;Oreg.;Utah;Europe;Asia (Afghanistan).
|reference=None
|publication title=Rev. Bryol.
|publication year=
|special status=
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/f6b125a955440c0872999024f038d74684f65921/coarse_grained_fna_xml/V27/V27_794.xml
|subfamily=Pottiaceae subfam. Barbuloideae
|genus=Didymodon
|species=Didymodon nicholsonii
}}<!--

-->[[Category:Treatment]][[Category:Didymodon]]