Difference between revisions of "Ditrichum pusillum"
Flora 50: 182. 1867,.
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|name=Ditrichum tortile | |name=Ditrichum tortile | ||
|authority=(Schrader) Brockmuller | |authority=(Schrader) Brockmuller | ||
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|name=Trichostomum tortile | |name=Trichostomum tortile | ||
|authority=Schrader | |authority=Schrader | ||
| − | }}{{Treatment/ID/Synonym | + | }} {{Treatment/ID/Synonym |
|name=Trichostomum tenue | |name=Trichostomum tenue | ||
|authority=Hedwig | |authority=Hedwig | ||
| − | }}{{Treatment/ID/Synonym | + | }} {{Treatment/ID/Synonym |
|name=Weissia capillacea | |name=Weissia capillacea | ||
|authority=Bridel | |authority=Bridel | ||
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|elevation=low to moderate elevations | |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). | |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, Ditrichum pusillum is morphologically very similar to D. ambiguum and D. tortuloides. When sporophytes are present, the dense, fine, obliquely striate peristome teeth with weak papillae immediately distinguish D. pusillum from those two species, which have spiculose peristome teeth. The spores of D. pusillum (10–19 µm) are also larger compared to those of D. ambiguum (6–11 µm) and D. tortuloides (9–13 µm). A discussion of the relationships of D. pusillum with both D. ambiguum and D. tortuloides was given by R. R. Ireland and H. Robinson (2001).</p> | + | |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= | |tables= | ||
|references= | |references= | ||
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|publication year= | |publication year= | ||
|special status= | |special status= | ||
| − | |source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/ | + | |source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/8f726806613d60c220dc4493de13607dd3150896/coarse_grained_fna_xml/V27/V27_658.xml |
|genus=Ditrichum | |genus=Ditrichum | ||
|species=Ditrichum pusillum | |species=Ditrichum pusillum | ||
Revision as of 16:56, 18 September 2019
Plants small, to ca. 1 cm, forming dull green tufts. Stems 0.4–1.2 cm, simple. Leaves 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. Specialized asexual reproduction by rounded to pyriform or irregularly-shaped, yellow to orange rhizoidal tubers, to 150 µm. Sexual condition dioicous; perichaetial leaves similar to stem leaves but with a somewhat longer subula narrowing more abruptly from the base. Seta becoming reddish with age, to 1.5 cm, erect. Capsule 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. Spores 11–20 µm, appearing ± smooth.
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
When sterile, Ditrichum pusillum is morphologically very similar to D. ambiguum and D. tortuloides. When sporophytes are present, the dense, fine, obliquely striate peristome teeth with weak papillae immediately distinguish D. pusillum from those two species, which have spiculose peristome teeth. The spores of D. pusillum (10–19 µm) are also larger compared to those of D. ambiguum (6–11 µm) and D. tortuloides (9–13 µm). A discussion of the relationships of D. pusillum with both D. ambiguum and D. tortuloides was given by R. R. Ireland and H. Robinson (2001).
Selected References
None.