View source for Brachythecium udum

{{Treatment/ID
|accepted_name=Brachythecium udum
|accepted_authority=I. Hagen
|publications={{Treatment/Publication
|title=Kongel. Norske Vidensk. Selsk. Skr. (Trondheim)
|place=1908(3): 4, plate 1, fig. 1. 1908
|year=1908
}}
|basionyms=
|synonyms={{Treatment/ID/Synonym
|name=Brachythecium mildeanum var. udum
|authority=(I. Hagen) Mönkemeyer
|rank=variety
}} {{Treatment/ID/Synonym
|name=B. salebrosum subsp. udum
|authority=(I. Hagen) J. J. Amann
|rank=subspecies
}}
|hierarchy=Brachytheciaceae;Brachythecium;Brachythecium udum
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Brachytheciaceae]]</div><div class="higher-taxon"><small>genus</small>[[Brachythecium]]</div><div class="higher-taxon"><small>species</small>[[Brachythecium udum]]</div></div>
|volume=Volume 28
|mention_page=page 415, 416, 422, 424
|treatment_page=page 427
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Plants </b>medium-sized to large, in dense mats, green to pale stramineous. <b>Stems</b> to 8 cm, ascending to upright, terete-foliate, quite loosely irregularly pinnate, often almost unbranched, branches to 7 mm, straight, terete-foliate. <b>Stem</b> leaves erect, occasionally erectopatent, closely imbricate, ovate to ovate-lanceolate, broadest at 1/12–1/9 leaf length, concave, not to somewhat plicate, 1.9–2.4 × 1–1.3 mm; base slightly rounded, inconspicuously decurrent; margins recurved usually only near base, entire to slightly serrulate; apex gradually tapered, often abruptly acuminate; costa to 40–70% leaf length, stronger near base, often much weaker distally, terminal spine absent; alar cells short-rectangular, enlarged, 20–30 × 20 µm, walls moderately thin, region slightly differentiated or enlarged, indistinctly or rarely distinctly delimited, of to 5 × 6 cells, pellucid; laminal cells linear, 70–115 × 7–9 µm, walls not or moderately porose; basal cells 12–18 µm wide, region in 2 or 3 rows. <b>Branch</b> leaves smaller, narrower. <b>Sexual</b> condition dioicous. <b>Sporophytes</b> unknown.</span><!--

-->{{Treatment/Body
|habitat=Wet soil, rock over soil, Arctic and alpine habitats
|elevation=low elevations (100 m)
|distribution=Alaska;n Eurasia.
|discussion=<p><i>Brachythecium udum</i> occurs in Siberia and northern Europe; it has been found in collections by W. C. Steere from Alaska (Noluck Lake), and probably occurs in northern Canada. The Alaska specimen was identified as <i>B. albicans</i>, which is superficially rather similar, but the different patterns of basal areolation easily distinguish them. Alar cells of <i>B. udum</i> are more differentiated than in <i>B. acutum</i>, and in permanently wet habitats, the alar cells can be rather strongly enlarged. Poor branching and commonly upright growth are also characteristic of <i>B. udum</i>.</p>
|tables=
|references=
}}<!--

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-->{{#Taxon:
name=Brachythecium udum
|authority=I. Hagen
|rank=species
|parent rank=genus
|synonyms=Brachythecium mildeanum var. udum;B. salebrosum subsp. udum
|basionyms=
|family=Brachytheciaceae
|habitat=Wet soil, rock over soil, Arctic and alpine habitats
|elevation=low elevations (100 m)
|distribution=Alaska;n Eurasia.
|reference=None
|publication title=Kongel. Norske Vidensk. Selsk. Skr. (Trondheim)
|publication year=1908
|special status=
|source xml=https://bibilujan@bitbucket.org/aafc-mbb/fna-data-curation.git/src/bb6b7e3a7de7d3b7888a1ad48c7fd8f5c722d8d6/coarse_grained_fna_xml/V28/V28_663.xml
|genus=Brachythecium
|species=Brachythecium udum
}}<!--

-->[[Category:Treatment]][[Category:Brachythecium]]