Hypnaceae

Diagnosis: Plants small to medium-sized, in thin to dense mats. Stems creeping, almost simple or irregularly but freely branched. Stem and branch leaves similar, usually complanate, erect to erect-spreading to wide spreading, symmetric or asymmetirc, lanceolate to ovate, acute to acuminate; margins entire to serrulate above, subentire to entire below; costa short and double or absent; cells linear, often flexuose, smooth, thin- to firm-walled, not porose, not becoming shorter in the acumen, becoming shorter, ± rectangular and sometimes porose toward the insertion; alar cells differentiated, few, quadrate to short-rectangular. Setae elongate, smooth, reddish; capsules erect to inclined or pendent, straight to arcuate, cylindric to short-cylindric, constricted below the mouth when dry; annulus not differentiated; operculum conic to short conic-rostrate; peristome double, coarsely papillose above, trabeculate at back. Calyptra cucullate, naked, smooth. Spores spherical, smooth to papillose.