View source for Hypnum imponens

{{Treatment/ID
|accepted_name=Hypnum imponens
|accepted_authority=Hedwig
|publications={{Treatment/Publication
|title=Sp. Musc. Frond.,
|place=290, plate 77, figs. 1–5. 1801
|year=1801
}}
|basionyms=
|synonyms={{Treatment/ID/Synonym
|name=Stereodon imponens
|authority=(Hedwig) Mitten
|rank=species
}}
|hierarchy=Hypnaceae;Hypnum;Hypnum imponens
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Hypnaceae]]</div><div class="higher-taxon"><small>genus</small>[[Hypnum]]</div><div class="higher-taxon"><small>species</small>[[Hypnum imponens]]</div></div>
|volume=Volume 28
|mention_page=page 534, 539, 540, 543
|treatment_page=page 542
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Plants </b>medium-sized to large, golden to yellow-green or brownish. <b>Stems</b> 3–10 cm, reddish brown, creeping, regularly pinnate, occasionally partly 2-pinnate or irregularly branched, branches 0.3–1.2 cm; hyalodermis absent, central strand weak; pseudoparaphyllia lanceolate or foliose, margins usually incised. <b>Stem</b> leaves falcate-secund, triangular-ovate to oblong-lanceolate, gradually narrowed to apex, 1.8–2 × 0.6–0.8 mm; base somewhat decurrent, not auriculate; margins plane or weakly recurved basally, serrulate distally or rarely nearly entire; acumen slender; costa double, short, or indistinct; alar cells subquadrate, basalmost cells deep orange-brown, outer cells hyaline, region weakly defined, not to weakly excavate, 5–10 cells high on margin; basal laminal cells broader than medial cells, yellow-orange to orange-brown, walls pitted; medial cells 50–70(–80) × 3–4(–5) µm, walls sometimes porose, not pitted. <b>Sexual</b> condition dioicous; inner perichaetial leaves oblong-lanceolate, margins serrate in apex, apex long, costa indistinct. <b>Seta</b> red-brown, 1–3 cm. <b>Capsule</b> erect to slightly inclined, red-brown, cylindric, 1.5–3 mm; annulus scarcely differentiated; operculum conic to rostellate; endostome cilia 1, sometimes 2 or rudimentary.</span><!--

-->{{Treatment/Body
|phenology=Capsules mature Jul–Sep.
|habitat=Decaying logs, rock, soil
|elevation=low to high elevations (0-2000 m)
|distribution=Greenland;N.B.;Nfld. and Labr.;N.S.;Ont.;P.E.I.;Que.;Ala.;Ark.;Conn.;Del.;D.C.;Fla.;Ga.;Ill.;Ind.;Iowa;Ky.;Maine;Md.;Mass.;Mich.;Minn.;Miss.;Mo.;N.H.;N.J.;N.Y.;N.C.;Ohio;Pa.;R.I.;S.C.;Tenn.;Tex.;Vt.;Va.;W.Va.;Wis.;Europe.
|discussion=<p><i>Hypnum imponens</i> is an amphi-Atlantic species that produces sporophytes, sometimes abundantly, in summer. The species is distinguished by the often pigmented, heterogeneous alar cells, usually reddish stems, long-toothed, foliose, usually numerous pseudoparaphyllia, and nearly erect, cylindric capsules. The branches usually emerge in one horizontal plane; the leaves are not to weakly plicate; the perichaetial leaf margins are often strongly revolute proximally; and the capsules are somewhat curved below the mouth. The lanceolate or filamentous pseudoparaphyllia and generally homogeneous alar cells of <i>H. cupressiforme</i> and its near relatives are usually sufficient to separate them from this species.</p>
|tables=
|references=
}}<!--

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-->{{#Taxon:
name=Hypnum imponens
|authority=Hedwig
|rank=species
|parent rank=genus
|synonyms=Stereodon imponens
|basionyms=
|family=Hypnaceae
|phenology=Capsules mature Jul–Sep.
|habitat=Decaying logs, rock, soil
|elevation=low to high elevations (0-2000 m)
|distribution=Greenland;N.B.;Nfld. and Labr.;N.S.;Ont.;P.E.I.;Que.;Ala.;Ark.;Conn.;Del.;D.C.;Fla.;Ga.;Ill.;Ind.;Iowa;Ky.;Maine;Md.;Mass.;Mich.;Minn.;Miss.;Mo.;N.H.;N.J.;N.Y.;N.C.;Ohio;Pa.;R.I.;S.C.;Tenn.;Tex.;Vt.;Va.;W.Va.;Wis.;Europe.
|reference=None
|publication title=Sp. Musc. Frond.,
|publication year=1801
|special status=
|source xml=https://bitbucket.org/aafc-mbb/fna-data-curation/src/2e0870ddd59836b60bcf96646a41e87ea5a5943a/coarse_grained_fna_xml/V28/V28_842.xml
|genus=Hypnum
|species=Hypnum imponens
}}<!--

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