1. Amphidium Schimp. 瓶藓属 ping xian shu
Coroll. Bryol. Eur. p. 39. 1856, nom. cons.
Plants slender, dull to dark green or yellowish brown, in dense cushions. Stems erect, simple or branched, radiculose below. Leaves crowded, crispate or contorted when dry, erect-spreading when moist, keeled, linear to narrowly oblong-lanceolate, acuminate at the apex; margins slightly recurved below the middle; costa single, strong, ending near the apex; upper cells small, rounded-quadrate to rounded-hexagonal, thick-walled, not transparent, pluripapillose; lower cells rectangular, thin-walled, hyaline, smooth. Dioicous or autoicous. Perichaetial leaves large, completely sheathing at base. Setae short, straight; capsules emergent or slightly exserted, erect, symmetric, oblong-cylindric from a broad, tapered neck, distinctly 8-ribbed and reddish brown when dry; opercula apiculate or rostrate with an oblique beak; annuli and peristome none; stomata present in the neck, superficial. Calyptrae cucullate, smooth. Spores small, spherical, smooth or nearly so.