Trichostomum obtusifolium Broth., Akad. Wiss. Wien Sitzungsber., Math.-Naturwiss. Kl., Abt. 1, 131: 210. 1923, hom. illeg. Oxystegus obtusifolius Hilp., Beih. Bot. Centralbl. 50(2): 667. 1933. Streblotrichum obtusifolium (Hilp.) P.-C. Chen, Hedwigia 80: 220. 1941. Barbula brevicaulis Broth., Symb. Sin. 4: 42. 1929, hom. illeg. Barbula yuennanensis Broth., Sitzungsber. Kaiserl. Akad. Wiss. Math.-Naturwiss. Cl., 133: 566. 1924, hom. illeg. Type. China: Yunnan, Kun-ming City (Yünnanfu), Handel-Mazzetti 71 (holotype H).

Plants very small, ca. 7 mm high, yellowish green, in loose tufts. Stems erect, simple, rarely branched, often radiculose at the base. Leaves contorted when dry, erect-spreading when moist, narrowly ovate-lanceolate to narrow-ligulate, rounded obtuse at apex; margins entire, undulate; costa stout, percurrent; upper leaf cells small, rounded-hexagonal, rather thick-walled, obscure, coarsely multi-papillose; basal cells differentiated, often larger, rectangular, smooth, hyaline, sometimes forming a V-shaped base. Dioicous. Perichaetial leaves enlarged, sheathing at base. Setae ca. 20 mm long, reddish, smooth; capsules erect, cylindrical; peristome filiform, twisted, densely papillose; opercula conic-rostrate with a long oblique beak. Spores yellowish, smooth.

Type. China: Hunan, Chang-sha (Tschangscha), Yo-lu-schan, Handel-Mazzetti 11435 (holotype H).

Specimens examined: BEIJING: Chang-ping Co., D.-K. Li 5598 (HKAS, SHM). FUJIAN: Wuyi Shan (Mt.), C.-H. Gao 7362 (HKAS, SHM). GUANGDONG: Lian Co., G.-Q. Zeng 645 (HKAS). HEILONGJIANG: Da-xing-an-ling (Greater Khingan), C. Gao 1977 (IFSBH). LIAONING: Qian Shan (Mt.), C. Gao 1977 (IFSBH). SICHUAN: Bei-pei Co., P.-C. Chen 674 (PE); Chang-jiang (River), Vacca 7808, 7811 (HKAS); Du Co., P.-C. Chen 1302 (HKAS). XIZANG: Lin-zhi Co., S.-K. Chen 351 (HKAS).

Habitat: on soil hill along roadsides or on rocks; Distribution: endemic to China.

Illustrations: Pl. 109, figs. 1–5.