Monographs Details: Acaulon
Authority: Sharp, Aaron J., et al. 1994. The Moss Flora of Mexico. Part One: Sphagnales to Bryales. Mem. New York Bot. Gard. 69 (1)
Family:Pottiaceae
Scientific Name:Acaulon
Description:Genus Description - Plants minute, bud-like, dull, brownish, scattered or gregarious. Stems very short, simple or, rarely, forked. Leaves few, crowded, erect-appressed, deeply concave, rarely concave-keeled, broadly oblong-ovate to elliptic, acute and cuspidate to awned; margins usually irregularly recurved near the apex, subentire to unevenly serrate or incised-dentate near the apex; costa narrow, brownish, subpercurrent to excurrent; upper cells hexagonal or subquadrate to rhombic or oblong-rhombic, firm-walled, smooth or, rarely, bearing 1 (or occasionally 2) blunt papillae at back; lower cells rectangular to oblong-hexagonal, lax, pale, smooth. Dioicous. Male plants much smaller. Setae very short, straight or shghtiy curved; capsules deeply immersed, spherical, not or almost imperceptibly apiculate, smooth, brown, shiny; operculum and peristome none; exothecial cells firm in texture but large and thin-walled, hexagonal. Spores spherical to ellipsoid. Calyptrae minute, mitrate, smooth, naked.