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)
Family:Pilotrichaceae
Scientific Name:Hypnella
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.

Discussion:

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.