Beih. Bot. Centralbl. 19(2): 127. 1905.
Plants large, green, dark green, or yellowish brown. Stems with branches arcuate, circinate or often attenuate to flagellate; central strand cells well differentiated, smaller; pseudoparaphyllia absent. Branch leaves incurved, secund when dry, erect, not complanate when moist, ovate-lanceolate, gradually tapered from base to apex, somewhat plicate proximally; margins plane, serrate in distal 1/3–1/4; apex sharply acuminate; costa strong, not obscured by laminal cells, not 2-fid at end, abaxial costa cells smooth; laminal cells rectangular to rhombic, slightly longer than wide, smooth, walls somewhat thickened; distal cells sometimes prorulate. Perichaetial leaves somewhat differentiated. [Seta 1.4–1.6 cm. Capsule slightly asymmetric; stomata few; peristome fairly well developed; exostome teeth yellowish, papillose and faintly striolate at base and beyond; endostome basal membrane to 3 or 4 cells high, segments papillose throughout. Calyptra smooth. Spores 16–22 µm].
Nearly worldwide, mostly temperate or montane regions.