Monographs Details: Isopterygiopsis
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:Hypnaceae
Scientific Name:Isopterygiopsis Z.Iwats.
Description:Genus Description - Plants small, in thin to dense, light- to yellow-green, glossy mats. Stems creeping, simple or sparsely and irregularly branched; epidermal cells small to large, with thin outer walls and thick inner ones; central strand sometimes present; rhizoids papillose, clustered in leaf axils; pseudoparaphyllia none. Asexual reproductive bodies sometimes clustered in leaf axils on stems and branches, cylindric or fusiform, 30-90 p m long, composed of 2-6 smooth cells. Stem and branch leaves similar, somewhat rigid, crowded and imbricate, erect-spreading, occasionally secund, sometimes complanate, smooth, flat or somewhat concave, symmetric, non-decurrent, lanceolate or ovate-lanceolate, long-acuminate to abmptly acuminate; margins plane to erect, entire or minutely sermlate; costa lacking or short and double; cells often flexuose, firm-walled, linear-fusiform, smooth or minutely promlose at back, with walls not pitted; alar cells undifferentiated or sometimes 1-3 quadrate to short-rectangular cells differentiated at the margins. Autoicous or dioicous. Perigonia and perichaetia clumped at base of stems and branches; bracts small, lanceolate to ovate, acuminate to abmptly filiform-acuminate, plane-margined. Setae smooth, elongate, straight to somewhat curved, twisted, red to reddish-brown; capsules erect to cernuous, straight to subarcuate, yellow to orange-brown, oblong to ovoid, smooth, contracted below the mouth and wrinkled at the neck when dry; operculum conic to obliquely rostrate, shorter than the urn; annulus deciduous, of 2-3 rows of cells; exostome teeth cross-striolate below, papillose above, bordered, trabeculate at back; endostome with a low to high basal membrane, keeled segments, and cilia shorter than the segments and in groups of 1-3, or sometimes absent. Spores spherical to ovoid, smooth or minutely papillose. Calyptrae naked.

Discussion:Isopapillose above, bordered, trabeculate at back; endostome with a low to high basal membrane, keeled segments, and cilia shorter than the segments and in groups of 1-3, or sometimes absent. Spores spherical to ovoid, smooth or minutely papillose. Calyptrae naked.