Oreoweisia laxifolia Kindberg 1888

Plants soft, rather large, to 5 cm high, yellowish green above, dark green below, not shiny, in dense tufts. Stems erect, often dichotomously branched. Leaves laxly spaced, curled when dry, erect-patent when moist, oblong-lingulate, up to 2.5 mm × 0.6 mm, somewhat sheathing at base, obtuse or blunt at apex; margins plane, irregularly serrulate near the apex; costa narrow, percurrent, with dorsal stereid band; upper cells quadrate to rounded-quadrate, thick-walled, mammillose on both surfaces; basal cells rectangular, ca. 60 µm × 18 µm, pellucid, thin-walled; alar cells not differentiated. Autoicous. Perichaetial leaves similar to upper stem leaves. Setae straight, orange-brown, ca. 10 mm long, twisted when dry; capsules reddish brown, erect, oblong-ovoid to short-cylindric, symmetric, contracted near the mouth, urns ca. 3 mm × 1 mm, exothecial cells rather thin-walled; peristome teeth inserted below the mouth, yellowish, smooth. Spores brownish, 18–20 µm in diameter, warty.

Distribution: China, Himalayas, India, and Japan.

Habitat: on soil and rocks, rarely on rotten wood in forests.

Didymodon laxifolius (Hook.f.) Mitt., J. Proc. Linn. Soc., Bot. Suppl. 1: 23. 1859. Zygodon schmidii C. Müll., Bot. Zeit. 11: 60. 1853. Oreoweisia schmidii (C. Müll.) Paris, Index Bryol. 868. 1897.

Oreoweisia laxifolia là một loài Rêu trong họ Dicranaceae. Loài này được (Hook. f.) Kindb. mô tả khoa học đầu tiên năm 1888.

疏叶石毛藓（学名：Oreoweisia laxifolia）为曲尾藓科石毛藓属下的一个种。