7. Dicranum fragilifolium Lindb. 折叶曲尾藓 zhe-ye qu-wei xian
_fvers. K. Sv. Vet.-Akad. Förh. 14: 125. 1857. Orthodicranum fragilifolium (Lindb.) Podp., Consp. Musc. Eur. 152. 1954. Type. Sweden.
Plants small to medium-sized, 1–5 cm high, green to pale yellowish green, weakly shiny, in compact tufts. Stems slender, densely foliate, erect, simple or rarely branched, radiculose below. Leaves appressed, slightly altered when dry, erect-spreading or somewhat falcate-secund when moist, narrowly lanceolate, 6–7 mm long, gradually narrowed to a linear, often fragile, channeled subulate acumen; margins plane, entire below, subentire or minutely serrulate near the apex; costa occupying ca. 1/4 the leaf base width, filling most of the subula, excurrent, ending in a long, smooth hairpoint, smooth at back above; upper cells irregular quadrate to short-rectangular, thick-walled, smooth; basal cells elongate, rounded linear-rectangular, thick-walled, porose; alar cells usually quadrate to short-rectangular, inflated, yellowish brown at the margins, hyaline next to the costa. Dioicous. Male plants dwarfed. Perichaetial leaves convolute-sheathing at base, abruptly subulate. Setae single, straight, 1–2 cm long, yellowish; capsules cylindric, up to 2 mm long, slightly curved, asymmetric, inclined, distinctly furrowed when dry; opercula conic-rostrate, nearly as long as the urns; annuli in 1–2 rows of large cells, often deciduous; peristome teeth lanceolate, vertically striolate below the middle. Spores ca. 24 µm in diameter, minutely papillose.