Didymodon rigidulus var. subulatus
Cryptog. Bryol. Lichénol. 2: 395. 1981,.
Stem leaves appressed to weakly spreading when dry, long-lanceolate, evenly broadened, long-oval; costa excurrent as a subula; proximal cells rectangular; distal laminal cells smooth, with quadrate lumens, lamina 2-stratose in distal 1/2–3/4; gemmae absent. Peristome teeth short, rudimentary, of 16 oval teeth with 1–2(–4) articulations.
Phenology: Capsule maturity unknown.
Habitat: Rocks, ledges, soil, canyons
Elevation: moderate to high elevations (1000-2000 m)
Distribution
Ariz., Tex., Mexico (Distrito Federal, Michoacán, Puebla, Querétaro, Sonora).
Discussion
Variety subulatus is similar to var. icmadophilus in leaf shape and most other characters, and intergrades occur. It may be regarded as a somewhat distinctive geographical variant. The variety phenocopies Grimmia hamulosa, which differs by the grimmiaceous peristome, homogeneous costal section, and more robust habit.
Selected References
None.