View source for Hygrohypnum duriusculum

{{Treatment/ID
|accepted_name=Hygrohypnum duriusculum
|accepted_authority=(De Notaris) D. W. Jamieson
|publications={{Treatment/Publication
|title=Taxon
|place=29: 152. 1980
|year=1980
}}
|special_status={{Treatment/ID/Special_status
|code=F
|label=Selected by author to be illustrated
}}
|basionyms={{Treatment/ID/Basionym
|name=Limnobium duriusculum
|authority=De Notaris
|publication_title=in F. Ardissone et al., Erb. Crittog. Ital., ser.
|publication_place=2: no. 204. 1869
}}
|synonyms={{Treatment/ID/Synonym
|name=Calliergon circulifolium
|authority=(Müller Hal. & Kindberg) Kindberg
}} {{Treatment/ID/Synonym
|name=C. dilatatum
|authority=(Wilson) Kindberg
}} {{Treatment/ID/Synonym
|name=C. pseudoarcticum
|authority=(Kindberg) Kindberg
}} {{Treatment/ID/Synonym
|name=Hygrohypnella duriuscula
|authority=(De Notaris) Ignatov & Ignatova
}} {{Treatment/ID/Synonym
|name=Hygrohypnum dilatatum
|authority=(Wilson) Loeske
}} {{Treatment/ID/Synonym
|name=H. eugyrium var. dilatatum
|authority=(Wilson) Grout
}} {{Treatment/ID/Synonym
|name=Hypnum circulifolium
|authority=Wilson
}} {{Treatment/ID/Synonym
|name=H. dilatatum
|authority=Kindberg
}} {{Treatment/ID/Synonym
|name=H. pseudoarcticum
|authority=(Kindberg) Kindberg
}} {{Treatment/ID/Synonym
|name=L. pseudoarcticum
|authority=(De Notaris) Ignatov & Ignatova
}} {{Treatment/ID/Synonym
|name=Ochyraea duriuscula
|authority=unknown
}}
|hierarchy=Amblystegiaceae;Hygrohypnum;Hygrohypnum duriusculum
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Amblystegiaceae]]</div><div class="higher-taxon"><small>genus</small>[[Hygrohypnum]]</div><div class="higher-taxon"><small>species</small>[[Hygrohypnum duriusculum]]</div></div>
|volume=Volume 28
|mention_page=page 270, 272, 277, 455
|treatment_page=page 274
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Plants </b>coarse, stiff, bright yellow-green, dull olive green, dirty yellow, or yellow-brown, with or without rusty mottling. <b>Stems</b> to 7 cm, leafy throughout or commonly denuded basally, irregularly branched; hyalodermis absent, epidermal cells small, walls thick, similar to subadjacent cortical cells, central strand strong. <b>Leaves</b> often secund, straight, shrinking, spreading, or contorted and twisted to the left when dry, appressed-imbricate and sometimes secund or spreading and somewhat contorted when moist, very broadly ovate, oval, orbicular, or less often ovate, plane or shallowly concave, (0.8–)1.1–1.7(–2.2) × (0.6–)0.8–1.3(–1.7) mm; margins plane or narrowly recurved basally, sometime involute when dry, usually entire, rarely denticulate; apex acute, obtuse, or short-apiculate; costa double, short, often to mid leaf, sometimes single and 2-fid to beyond mid leaf; alar cells quadrate, short-rectangular, or irregular, walls incrassate, clearly pigmented with age, region clearly differentiated, irregular; basal laminal cells wider, longer, walls thicker; medial cells short- to long-fusiform or linear-flexuose, (26–)30–70(–90) × (3–)5–7(–9) µm; apical cells shorter; marginal cells rarely longer than 55 µm. <b>Sexual</b> condition autoicous; perichaetial inner leaves with apical laminal cells smooth abaxially. <b>Seta</b> yellowish red, red, or maroon, 0.9–2.4 cm. <b>Capsule</b> with endostome cilia 1–3.</span><!--

-->{{Treatment/Body
|habitat=Irrigated, emergent acidic rock in montane streams
|elevation=moderate to high elevations (200-3600 m)
|distribution=Greenland;Alta.;B.C.;Nfld. and Labr.;N.S.;Ont.;Que.;Alaska;Ariz.;Calif.;Colo.;Conn.;Idaho;Maine;Mass.;Mont.;Nev.;N.H.;N.Mex.;N.Y.;N.C.;Tenn.;Utah;Vt.;Va.;Wash.;Wyo.;Europe;Asia.
|discussion=<p><i>Hygrohypnum duriusculum</i> is at the center of a confusing group of species including <i>H. alpinum</i>, <i>H. bestii</i>, and <i>H. molle</i>. These species may be distinguished as follows: <i>H. alpinum</i> is a western species with leaves typically orbicular and alar cells forming a rectangular group of more or less rectangular or irregular, enlarged, thin-walled cells; <i>H. bestii</i> stands alone in having exceedingly long marginal laminal cells, generally exceeding 60 µm; <i>H. duriusculum</i> exhibits very broadly ovate to oblong-elliptic, oval to orbicular leaves, alar cells forming a well-defined broad group of quadrate, short-rectangular, or irregular, often excavated cells with thickened, regularly discolored walls; <i>H. molle</i> occurs only in the western part of the flora area and has leaves mostly ovate to broadly ovate with an acute but blunt apex, alar cells essentially undifferentiated from surrounding cells, leaves little changed from moist to dry conditions and more or less straight and loosely imbricate. It should be noted that while <i>H. duriusculum</i> occurs across the continent, the plants from western North America are somewhat smaller than those from the east.</p>
|tables=
|references=
}}<!--

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-->{{#Taxon:
name=Hygrohypnum duriusculum
|author=
|authority=(De Notaris) D. W. Jamieson
|rank=species
|parent rank=genus
|synonyms=Calliergon circulifolium;C. dilatatum;C. pseudoarcticum;Hygrohypnella duriuscula;Hygrohypnum dilatatum;H. eugyrium var. dilatatum;Hypnum circulifolium;H. dilatatum;H. pseudoarcticum;L. pseudoarcticum;Ochyraea duriuscula
|basionyms=Limnobium duriusculum
|family=Amblystegiaceae
|habitat=Irrigated, emergent acidic rock in montane streams
|elevation=moderate to high elevations (200-3600 m)
|distribution=Greenland;Alta.;B.C.;Nfld. and Labr.;N.S.;Ont.;Que.;Alaska;Ariz.;Calif.;Colo.;Conn.;Idaho;Maine;Mass.;Mont.;Nev.;N.H.;N.Mex.;N.Y.;N.C.;Tenn.;Utah;Vt.;Va.;Wash.;Wyo.;Europe;Asia.
|reference=None
|publication title=Taxon
|publication year=1980
|special status=Selected by author to be illustrated
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/f6b125a955440c0872999024f038d74684f65921/coarse_grained_fna_xml/V28/V28_428.xml
|genus=Hygrohypnum
|species=Hygrohypnum duriusculum
}}<!--

-->[[Category:Treatment]][[Category:Hygrohypnum]]