4. Bryoerythrophyllum hostile (Herz.) P. -C. Chen, Hedwigia. 80:264. 1941; Erythrophyllum hostile Herz., Hedwigia 65: 151. 1925.
Didymodon hostilis (Herz.) Broth., Nat. Pflanzenfam. (ed. 2) 11: 528. 1925.
Plants very small, 5–7 mm high, yellowish brown to reddish brown, in loose tufts. Stems erect, simple; central strand present. Leaves narrowly elliptic to ligulate, obtusely pointed to apiculate at the apex; lower margins entire, recurved, upper margins irregularly dentate, borders distinctly differentiated, consisting of 3–5 rows of hyaline or reddish cells, with fewer papillae; costa strong, attenuate, percurrent; upper leaf cells greenish, rounded hexagonal, each cell with numerous small, rounded or C-shaped papillae; basal cells larger, rectangular, smooth, hyaline, or reddish, distinctly differentiated from the upper cells. Sporophytes not seen.
Type. China: Yunnan, Da-yao Co., S. Ten 74 (holotype H).
Chinese specimens examined: XIZANG: Long-zi Co., M. Zang 1272 (HKAS). YUNNAN: Kun-ming City, X.-J. Li 80-2063 (HKAS), S.-M. Yu 2062 (HKAS).
Habitat: on rocks or tree trunks; Distribution: endemic to China.
Illustrations: Pl. 113, figs. 7–8.