1. Anacamptodon Brid. 反齿藓属 fan-chi xian shu
Muscol. Recent. Suppl. 4: 136. Pl. 2: f. 11. 1819 .
Plants slender, yellowish green or green, not glossy or weakly glossy, in lax tufts. Stems prostrate, apex ascending, with many rhizoids; simple or rarely branched, branches short; branches erect or ascending, densely foliate. Leaves erect, often secund, ovate or ovate-lanceolate, concave, acuminate or suddenly narrowed to a long apex; margins plane, entire or toothed; costa rigid, ending above midleaf, rarely percurrent; upper leaf cells green, oblong or oblong-hexagonal; alar cells quadrate. Autoicous. Perichaetial leaves lanceolate, acuminate, not sheathing at base; costa slender. Setae slender, erect, purple red or dark brown, twisted when dry; capsules erect, ovoid, symmetrical, apophysis short and distinct, constricted below capsule mouth; annuli large and broad, thin-walled, persistent; peristome double; exostome teeth often in pairs, erect when moist, reflexed when dry, widely lanceolate, brown, smooth or finely papillose, with lamellae inside; endostome segments shorter than teeth, linear, brown, nearly smooth; basal membrane absent; opercula conic, with a straight or oblique beak. Calyptrae cucullate.