View source for Ptychostomum cernuum

{{Treatment/ID
|accepted_name=Ptychostomum cernuum
|accepted_authority=(Hedwig) Hornschuch
|publications={{Treatment/Publication
|title=Syll. Pl. Nov.
|place=1: 64. 1822
|year=1822
}}
|basionyms={{Treatment/ID/Basionym
|name=Cynontodium cernuum
|authority=Hedwig
|publication_title=Sp. Musc. Frond.,
|publication_place=58, plate 9. 1801
}}
|synonyms={{Treatment/ID/Synonym
|name=Bryum uliginosum
|authority=(Bridel) Bruch & Schimper
}}
|hierarchy=Bryaceae;Ptychostomum;Ptychostomum subg. Ptychostomum;Ptychostomum cernuum
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Bryaceae]]</div><div class="higher-taxon"><small>genus</small>[[Ptychostomum]]</div><div class="higher-taxon"><small>subgenus</small>[[Ptychostomum subg. Ptychostomum]]</div><div class="higher-taxon"><small>species</small>[[Ptychostomum cernuum]]</div></div>
|volume=Volume 28
|mention_page=page 167, 170, 172
|treatment_page=page 169
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Plants </b>in dense or open turfs, green or yellow-green. <b>Stems</b> 0.5–3 cm, fertile stems comose, innovations evenly foliate. <b>Leaves</b> green to yellow-green, crowded, strongly contorted to shrunken when dry, ovate-lanceolate, flat, 1–3.5(–4) mm, often gradually enlarged toward stem apex; base green, not decurrent; margins revolute proximally, plane distally, limbidium strong, in 2 or 3 rows; apex acuminate; costa percurrent to short-excurrent, awn stout; proximal laminal cells long-rectangular, 3–5:1; medial and distal cells 18–22 µm wide, 3–4:1, walls thin. <b>Specialized</b> asexual reproduction absent. <b>Sexual</b> condition autoicous. <b>Seta</b> yellow-brown or brown, 2–4 cm, stout, straight to somewhat flexuose. <b>Capsule</b> brown, shape highly variable, elongate-pyriform to clavate, somewhat to strongly curved, (3–)4–6(–7) mm, mouth yellow-brown; hypophysis slender; operculum conic, apiculate; peristome reduced; exostome teeth yellow throughout or rarely hyaline distally, lamellae straight, pores absent near base along mid line; endostome not adherent to exostome, basal membrane 1/2 exostome height, segments with ovate perforations, cilia absent or rudimentary. <b>Spores</b> 28–32(–35) µm, yellow to green.</span><!--

-->{{Treatment/Body
|phenology=Capsules mature Jun–Sep.
|habitat=Wet soil, along streams, wetlands, calcareous habitats
|elevation=low to high elevations (0-3000 m)
|distribution=Greenland;Alta.;B.C.;Man.;Nfld. and Labr.;N.W.T.;Nunavut;Ont.;Que.;Sask.;Yukon;Colo.;Ill.;Iowa;Mich.;Minn.;Nebr.;N.Mex.;N.Y.;N.Dak.;Ohio;Pa.;S.Dak.;s South America;Eurasia.
|discussion=<p><i>Ptychostomum cernuum</i> is a circumpolar arctic-boreal to north-temperate species characterized by long ovate-lanceolate leaves with a short awn, green leaf base, autoicous sexual condition, and extremely long, curved capsule. The species is related to <i>P. pallens</i>, but differs in its longer more strongly curved capsules, autoicous sexual condition, larger spores, and yellow-green color. <i>Ptychostomum turbinatum</i> is similar, and generally capsules are needed to separate these species. <i>Ptychostomum cernuum</i> is autoicous, smaller, and has longer narrower ovate-lanceolate leaves, while <i>P. turbinatum</i> is dioicous, often very large, and has broader, more ovate leaves. <i>Ptychostomum cernuum</i> superficially resembles <i>Pohlia elongata</i>.</p>
|tables=
|references=
}}<!--

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-->{{#Taxon:
name=Ptychostomum cernuum
|author=
|authority=(Hedwig) Hornschuch
|rank=species
|parent rank=subgenus
|synonyms=Bryum uliginosum
|basionyms=Cynontodium cernuum
|family=Bryaceae
|phenology=Capsules mature Jun–Sep.
|habitat=Wet soil, along streams, wetlands, calcareous habitats
|elevation=low to high elevations (0-3000 m)
|distribution=Greenland;Alta.;B.C.;Man.;Nfld. and Labr.;N.W.T.;Nunavut;Ont.;Que.;Sask.;Yukon;Colo.;Ill.;Iowa;Mich.;Minn.;Nebr.;N.Mex.;N.Y.;N.Dak.;Ohio;Pa.;S.Dak.;s South America;Eurasia.
|reference=None
|publication title=Syll. Pl. Nov.
|publication year=1822
|special status=
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/f6b125a955440c0872999024f038d74684f65921/coarse_grained_fna_xml/V28/V28_269.xml
|genus=Ptychostomum
|subgenus=Ptychostomum subg. Ptychostomum
|species=Ptychostomum cernuum
}}<!--

-->[[Category:Treatment]][[Category:Ptychostomum subg. Ptychostomum]]