Difference between revisions of "Orthotrichum pycnophyllum"
in J. K. A. Müller, Syn. Musc. Frond. 1: 709. 1849.
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Revision as of 20:48, 24 September 2019
Plants 0.8–4 cm. Stem leaves loosely erect-spreading when dry, lanceolate, 2.5–4 mm; margins revolute to just below apex, often wavy and slightly notched near apex; apex gradually acuminate to long acuminate-cuspidate; basal laminal cells elongate, walls thick, nodose; distal cells 7–13 µm, 1-stratose, papillae 1 or 2 per cell, conic, size moderate. Specialized asexual reproduction absent. Sexual condition gonioautoicous. Seta 1–1.5 mm. Capsule immersed to fully exserted, usually 1/2–1/4 emergent, oblong-ovate to cylindric, 1.5–2 mm, smooth to slightly 8-ribbed; stomata superficial; peristome double; prostome absent; exostome teeth 16, separate to base, recurved, acute, obscurely and densely papillose; endostome segments 16, separate to base, well developed, thick, stout, of 2 rows of cells, narrower than exostome teeth, usually not erose, yellowish brown, coarsely papillose. Calyptra conic-oblong, smooth, moderately hairy, hairs smooth. Spores 17–29 µm.
Habitat: Branches and trunks of trees
Elevation: moderate to high elevations (500-2000 m)
Distribution
![V28 92-distribution-map.gif](/w/images/c/c8/V28_92-distribution-map.gif)
Ariz., N.Mex., Tex., Mexico, Central America (Guatemala, Panama), South America.
Discussion
Distinguishing features of Orthotrichum pycnophyllum are the 16 exostome teeth that are not connate at the base to form a membrane as in O. keeverae, 16 endostome segments, and a slightly ribbed capsule that is usually 3/4 emergent.
Selected References
None.