Monographs Details: Hypnella
Authority: Sharp, Aaron J., et al. 1994. The Moss Flora of Mexico. Part Two: Orthotrichales to Polytrichales. Mem. New York Bot. Gard. 69 (2)
Description:Genus Description - Plants slender to meclium-sized, in dull, pale- to dark-green, red-brown, or blackish mats. Stems creeping, freely branched. Leaves in 8 rows, somewhat to strongly complanate, sometimes secund, imbricate when dry, ± concave, elliptic to oblong, truncate, obtuse, acute, acuminate, or filiform-attenuate; costae none or double, short or elongate; cells elongate, with 3-6 papillae in a row over the lumen (sometimes small and indistinct), those toward the insertion shorter, broader, smooth. Setae elongate, red, usually rough above; capsules inclined to pendent, oblong-cylindric; annulus present; exostome teeth lanceolate red-brown, furrowed, papillose; endostome consisting of a high basal membrane and narrow, keeled, yellow, papillose or nearly smooth segments, cilia none. Calyptra covering the operculum or sometimes the upper half ofthe urn, smooth, lobed.
The genus has been reduced to six species in recent revisionary works (Crosby et al., 1985; Allen 1986) in which it has been considered one ofthe Sematophyllaceae. T h e following species is given a sizable synonymy.