Difference between revisions of "Didymodon rigidulus var. gracilis"
Cryptog. Bryol. Lichénol. 2: 393. 1981,.
FNA>Volume Importer |
FNA>Volume Importer |
||
| Line 13: | Line 13: | ||
|name=Barbula acuta | |name=Barbula acuta | ||
|authority=(Bridel) K. Saito | |authority=(Bridel) K. Saito | ||
| − | }}{{Treatment/ID/Synonym | + | }} {{Treatment/ID/Synonym |
|name=Didymodon acutus | |name=Didymodon acutus | ||
|authority=unknown | |authority=unknown | ||
| Line 31: | Line 31: | ||
|elevation=low to high elevations (0-3000 m) | |elevation=low to high elevations (0-3000 m) | ||
|distribution=Greenland;Alta.;B.C.;Man.;Nfdl. and Labr.;N.W.T.;Nunavut;Ont.;Que.;Sask.;Yukon;Alaska;Ariz.;Colo.;Iowa;Kans.;Minn.;Mo.;Mont.;Nev.;N.Mex.;S.Dak.;Tenn.;Tex.;Utah;Wis.;Wyo.;Mexico;Central America;South America;Europe;Asia (Siberia);Africa;Atlantic Islands (Iceland). | |distribution=Greenland;Alta.;B.C.;Man.;Nfdl. and Labr.;N.W.T.;Nunavut;Ont.;Que.;Sask.;Yukon;Alaska;Ariz.;Colo.;Iowa;Kans.;Minn.;Mo.;Mont.;Nev.;N.Mex.;S.Dak.;Tenn.;Tex.;Utah;Wis.;Wyo.;Mexico;Central America;South America;Europe;Asia (Siberia);Africa;Atlantic Islands (Iceland). | ||
| − | |discussion=<p>Variety gracilis may sometimes have gemmae and the distal lamina is occasionally 2-stratose in patches, but it differs from var. rigidulus most clearly in its the short- to long-lanceolate leaves. The distal laminal cells are commonly papillose, and their lumens are oval or rounded-quadrate. Because of intergradation, some collections must be assigned to this variety only on the basis of a majority of the characters given in the key. Although leaves in this variety are short in dry habitats, associated with fragile stems, leaf length in collections from moist environments is generally longer. The small distal laminal cells, broad costa to 6 cells in width at mid leaf, and the strong stem central strand serve to distinguish this taxon from Didymodon asperifolius.</p> | + | |discussion=<p>Variety gracilis may sometimes have gemmae and the distal lamina is occasionally 2-stratose in patches, but it differs from <i></i>var.<i> rigidulus</i> most clearly in its the short- to long-lanceolate leaves. The distal laminal cells are commonly papillose, and their lumens are oval or rounded-quadrate. Because of intergradation, some collections must be assigned to this variety only on the basis of a majority of the characters given in the key. Although leaves in this variety are short in dry habitats, associated with fragile stems, leaf length in collections from moist environments is generally longer. The small distal laminal cells, broad costa to 6 cells in width at mid leaf, and the strong stem central strand serve to distinguish this taxon from <i>Didymodon asperifolius</i>.</p> |
|tables= | |tables= | ||
|references= | |references= | ||
| Line 55: | Line 55: | ||
|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_779.xml |
|subfamily=Pottiaceae subfam. Barbuloideae | |subfamily=Pottiaceae subfam. Barbuloideae | ||
|genus=Didymodon | |genus=Didymodon | ||
Revision as of 17:57, 18 September 2019
Stem leaves appressed to weakly spreading when dry, costa usually percurrent to short-excurrent as a rigid subula, short-lanceolate, seldom-lanceolate, base evenly broadened, ovate to elliptic or oblong, proximal cells short-rectangular, distal laminal cells usually papillose, quadrate, with quadrate lumens, occasionally 2-stratose on the margins in patches; gemmae often present in distal leaf axils. Peristome teeth short and straight to long and twisted.
Phenology: Capsules mature spring–winter.
Habitat: Basalt, calcareous outcrops and ledges, gravel, soil, silt, frostboil, tundra, along roads and paths
Elevation: low to high elevations (0-3000 m)
Distribution
Greenland, Alta., B.C., Man., Nfdl. and Labr., N.W.T., Nunavut, Ont., Que., Sask., Yukon, Alaska, Ariz., Colo., Iowa, Kans., Minn., Mo., Mont., Nev., N.Mex., S.Dak., Tenn., Tex., Utah, Wis., Wyo., Mexico, Central America, South America, Europe, Asia (Siberia), Africa, Atlantic Islands (Iceland).
Discussion
Variety gracilis may sometimes have gemmae and the distal lamina is occasionally 2-stratose in patches, but it differs from var. rigidulus most clearly in its the short- to long-lanceolate leaves. The distal laminal cells are commonly papillose, and their lumens are oval or rounded-quadrate. Because of intergradation, some collections must be assigned to this variety only on the basis of a majority of the characters given in the key. Although leaves in this variety are short in dry habitats, associated with fragile stems, leaf length in collections from moist environments is generally longer. The small distal laminal cells, broad costa to 6 cells in width at mid leaf, and the strong stem central strand serve to distinguish this taxon from Didymodon asperifolius.
Selected References
None.