2. Groutiella Steere in Crum & Steere 小蓑藓属 xiao suo xian shu
Bryologist 53: 145. 1950.
Craspedophyllum Grout, N. Amer. Fl. 15A: 38. 1946, hom. illeg.
Micromitrium Schimp. ex Besch., Mém. Soc. Sci. Nat. Cherbourg 16: 190. 1872, hom. inval.
Plants small to medium-sized, yellowish green to dark green, or reddish green, olive-brown or reddish brown, in densely tomentose mats. Primary stems creeping; secondary stems erect-ascending, irregularly branched. Leaves contorted, spirally twisted or crisped when dry, spreading when moist, linear-lanceolate, lanceolate, oblong-lanceolate to ovate-lanceolate or lingulate, keeled, acuminate, acute, mucronate or obtuse at the apex, sometimes with fragile tips; margins entire above, subentire to serrulate at the base, often bordered by several rows of narrow, elongate cells, (rarely by short-rectangular cells) from the base to 1/4–2/3 the leaf length; costae strong, subpercurrent to shortly excurrent; leaf cells incrassate, rounded-hexagonal, smooth to bulging or mammillose, basal cells at the insertion shortly oblong, smooth; basal juxtacostal cells somewhat enlarged and thin-walled. Dioicous. Setae 4–15 mm long, smooth; capsules oblong-obovoid to cylindrical, 1–4 mm long, smooth or furrowed; opercula rostrate; stomata superficial; peristome rudimentary, consisting of a low, papillose membrane. Calyptrae mitrate-campanulate, plicate, lobed or laciniate at the base, naked or sparsely hairy. Spores spherical, finely papillose.