32. Wilsoniella C. Müll., Bot. Centralbl. 7: 345. 1881.
威氏藓属
Plants small, slender, light yellowish green, gregarious or loosely tufted. Stems erect, simple or rarely branched, radiculose below. Leaves soft, thin, usually small below, becoming larger, crowded above, erect-flexuose when dry, erect-spreading when moist, linear to oblong-lanceolate, tapering to a blunt or acute apex; margins plane and entire except serrulate at the apex; costa narrow, slender, subpercurrent; apical cells rhomboidal to elongate-hexagonal, thin-walled, sometimes slightly projecting at the upper cell ends; median and lower cells larger, long-rectangular to linear, thin-walled, smooth. Autoicous. Perichaetial leaves similar to the upper stem leaves. Setae straight, slender, yellowish; capsules short-cylindric, with a short neck; opercula obliquely long-rostrate; annuli developed, revoluble; peristome teeth 16, linear to filiform, reddish, divided nearly to the base, striate nearly throughout, with coarsely papillose ridges and grooves arranged longitudinally below, becoming obliquely to horizontal or spiral above. Calyptrae cucullate, smooth and entire at base. Spores spherical, yellowish, papillose.
Wilsoniella contains about eight species in the world, with most species distributed in Asia, Africa, and tropical America. One species is known from China.
