Leptodictyum

Autoicous. Asexual propagules absent. Mats on soil, rocks, logs, tree bases and aquatic. Stems creeping or free-floating, irregularly to sparingly branched in a single plane, with sparse rhizoids along stem or below leaf insertion or glabrous; paraphyllia absent; central strand present. Branch leaves more complanate and smaller than stem leaves, otherwise similar, erect- to wide-spreading when moist, twisted longitudinally or scarcely altered when dry, ovate- or oblong-lanceolate, weakly decurrent; apex acuminate or acute; costa single, extending around 1/2–3/4 of leaf length; margin entire, plane, without a border; laminal cells linear-rhomboidal, becoming shorter and rectangular at base, smooth, unistratose; alar cells not or weakly differentiated, rectangular or subquadrate, enlarged. Capsule inclined to horizontal, curved, oblong-cylindric, with a caducous annulus. Calyptra cucullate, smooth, glabrous. Operculum conic or apiculate. Peristome double; endostome segments equal height as exostome, with a basal membrane half the height of exostome; cilia present.