View source for Ditrichum pusillum

{{Treatment/ID
|accepted_name=Ditrichum pusillum
|accepted_authority=(Hedwig) Hampe
|publications={{Treatment/Publication
|title=Flora
|place=50: 182. 1867,
}}
|basionyms={{Treatment/ID/Basionym
|name=Didymodon pusillum
|authority=Hedwig
|rank=species
|publication_title=Sp. Musc. Frond.,
|publication_place=104. 1801
}}
|synonyms={{Treatment/ID/Synonym
|name=Ditrichum tortile
|authority=(Schrader) Brockmuller
|rank=species
}} {{Treatment/ID/Synonym
|name=Trichostomum tortile
|authority=Schrader
|rank=species
}} {{Treatment/ID/Synonym
|name=Trichostomum tenue
|authority=Hedwig
|rank=species
}} {{Treatment/ID/Synonym
|name=Weissia capillacea
|authority=Bridel
|rank=species
}}
|hierarchy=Ditrichaceae;Ditrichum;Ditrichum pusillum
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Ditrichaceae]]</div><div class="higher-taxon"><small>genus</small>[[Ditrichum]]</div><div class="higher-taxon"><small>species</small>[[Ditrichum pusillum]]</div></div>
|volume=Volume 27
|mention_page=page 450, 454, 456
|treatment_page=page 455
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Plants </b>small, to ca. 1 cm, forming dull green tufts. <b>Stems</b> 0.4–1.2 cm, simple. <b>Leaves</b> to ca. 3.5 mm, erect-patent, weakly secund, lanceolate to linear-lanceolate, gradually acuminate to a channelled subula, acute, lamina 1-stratose except on margins; margins bistratose, entire or serrulate near the apex, irregularly thickened and recurved at least in distal half; costa stout, percurrent to excurrent, in section with abaxial stereid band; proximal lamina cells elongate-rectangular, distal lamina cells subquadrate to short-rectangular or somewhat irregular in outline, ± incrassate. <b>Specialized</b> asexual reproduction by rounded to pyriform or irregularly-shaped, yellow to orange rhizoidal tubers, to 150 µm. <b>Sexual</b> condition dioicous; perichaetial leaves similar to stem leaves but with a somewhat longer subula narrowing more abruptly from the base. <b>Seta</b> becoming reddish with age, to 1.5 cm, erect. <b>Capsule</b> erect, dark brown to reddish brown, ovoid to cylindrical, symmetric, 1–2 mm, smooth to ± furrowed when dry; operculum obliquely conic-rostrate, blunt, 0.3–0.7 mm; peristome split nearly to the base into 2 segments, brown, densely and finely obliquely-ridged and lightly papillose, 200–250 µm. <b>Spores</b> 11–20 µm, appearing ± smooth.</span><!--

-->{{Treatment/Body
|phenology=Capsules mature spring–summer (Apr–Jun).
|habitat=Bare, disturbed calcium-free clay, sandy or gravely soil banks, disturbed habitats, especially along roads and trails, and sometimes in cliff crevices
|elevation=low to moderate elevations
|distribution=B.C.;N.B.;Nfld. and Labr.;N.S.;Ont.;P.E.I.;Ala.;Ark.;Fla.;Ga.;Ill.;Ind.;Iowa;Ky.;La.;Maine;Mass.;Mich.;Minn.;Mo.;Nebr.;N.Y.;Tenn.;Tex.;Va.;Wis.;Europe;Asia;Africa;Atlantic Islands (Iceland).
|discussion=<p>When sterile, <i>Ditrichum pusillum</i> is morphologically very similar to <i>D. ambiguum</i> and <i>D. tortuloides</i>. When sporophytes are present, the dense, fine, obliquely striate peristome teeth with weak papillae immediately distinguish <i>D. pusillum</i> from those two species, which have spiculose peristome teeth. The spores of <i>D. pusillum</i> (10–19 µm) are also larger compared to those of <i>D. ambiguum</i> (6–11 µm) and <i>D. tortuloides</i> (9–13 µm). A discussion of the relationships of <i>D. pusillum</i> with both <i>D. ambiguum</i> and <i>D. tortuloides</i> was given by R. R. Ireland and H. Robinson (2001).</p>
|tables=
|references=
}}<!--

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-->{{#Taxon:
name=Ditrichum pusillum
|authority=(Hedwig) Hampe
|rank=species
|parent rank=genus
|synonyms=Ditrichum tortile;Trichostomum tortile;Trichostomum tenue;Weissia capillacea
|basionyms=Didymodon pusillum
|family=Ditrichaceae
|phenology=Capsules mature spring–summer (Apr–Jun).
|habitat=Bare, disturbed calcium-free clay, sandy or gravely soil banks, disturbed habitats, especially along roads and trails, and sometimes in cliff crevices
|elevation=low to moderate elevations
|distribution=B.C.;N.B.;Nfld. and Labr.;N.S.;Ont.;P.E.I.;Ala.;Ark.;Fla.;Ga.;Ill.;Ind.;Iowa;Ky.;La.;Maine;Mass.;Mich.;Minn.;Mo.;Nebr.;N.Y.;Tenn.;Tex.;Va.;Wis.;Europe;Asia;Africa;Atlantic Islands (Iceland).
|reference=None
|publication title=Flora
|publication year=
|special status=
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/f50eec43f223ca0e34566be0b046453a0960e173/coarse_grained_fna_xml/V27/V27_658.xml
|genus=Ditrichum
|species=Ditrichum pusillum
}}<!--

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