4. Bryoerythrophyllum hostile (Herz.) P.-C. Chen 异叶红叶藓 yi-ye hong-ye xian
Hedwigia 80: 264. 1941. Didymodon hostilis (Herz.) Broth., Nat. Pflanzenfam. (ed. 2) 11: 528. 1925. Erythrophyllum hostile Herz., Hedwigia 65: 151. 1925. Type. China: Yunnan, Da-yao Co., S. Ten 74 (holotype H).
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.