Bryoerythrophyllum dentatum (Mitt.) P.-C. Chen, Hedwigia 80: 253. 1941. Didymodon dentatus Mitt., J. Proc. Linn. Soc., Bot., Suppl. 1: 23. 1859. Bryoerythrophyllum pergemmascens (Broth.) P.-C. Chen, Hedwigia 80: 261. 1941. Leptodontium pergemmascens Broth., Akad. Wiss. Wien Sitzungsber., Math.-Naturwiss. Kl., Abt. 1: 133. 565. 1924. Bryoerythrophyllum yichunense C. Gao, Fl. Musc. Chin. Boreali-Orient. 379. f. 80. 1977, syn. nov. Type. China: Heilongjiang, Yi-chuan Co., P.-C. Chen & C. Gao 346 (holotype IFSBH). Leptodontium gracillimum Nog., J. Jap. Bot. 20: 142. 1945. Leptodontium nakaii Okamura, J. Coll. Sci. Imp. Univ. Tokyo 36(7): 9. 5 A–H. 1915. Leptodontium warnstorfii Fleisch., Musci Buitenzorg 1: 364, f. 67. 1904.

Plants small, thick, to 20 mm high, yellowish green, scattered or in loose tufts. Stems erect, simple or branched, densely foliate, sparsely radiculose at base. Leaves erect to somewhat involute when dry, erect- to wide-spreading when moist, oblong-ovate, 1.2–1.8 mm × 0.3–0.5 mm, obtusely pointed to broadly acute; margins entire, recurved in the lower half, irregularly loosely dentate in the upper half; costa slender, ending just below the apex; upper leaf cells rounded-hexagonal, 10–14 µm × 8–12 µm, strongly thick-walled, with several simple papillae; basal cells irregularly to linear-rectangular, 30–55 µm × 10–20 µm, thin-walled, smooth, hyaline. Sporophytes unknown.

Type. Europe.

Chinese specimens examined: SICHUAN: Dao-cheng Co., S. He 31678 (MO); De-rong Co., X.-J. Li 81–1532 (HKAS); Kang-ding Co., Z.-X. Qu 7740 (HKAS); Ma-er-kang Co., X.-J. Li 1488 (HKAS); Mu-li Co., P.-Q. Li 42175 (HKAS); Nan-chuan Co., X.-Y. Hu 0048 (MO, PE); Song-pan Co., Allen 7092 (MO); Xiang-cheng Co., L.-S. Wang 812535 (HKAS), J.-L. Yang 4482 (HKAS); Ya-jiang Co., S. He 31999 (MO); Yung-ning, Handel-Mazzetti 7199 (H). TAIWAN: Hua-lien Co., Shevock 14424 (MO); Ping-tung Co., C.-C. Chuang 1529 (MO). XINJIANG: A-ke Co., Y. Xia 6 (HKAS). XIZANG: Lei-wu-qi, M. Zang 5309 (HKAS); Mo-tuo Co., Y.-G. Su 2505 (HKAS); Ya-dong Co., M. Zang 69 (HKAS). YUNNAN: De-qin Co., X.-J. Li 81–1945 (HKAS); Kun-ming City, Z.-M. Li 76c (HYUB); Li-jiang Co., X.-J. Li 85211, 85258 (HKAS); Teng-chong Co., J.-H. Pang 13 (HKAS); Xiao-zhong-dian Co., X.-J. Li 81–948 (HKAS); Zhong-dian (chungtien) Co., Handel-Mazzetti 4744 (HKAS).

Habitat: on tree trunks, ground, or grasslands; Distribution: China, Japan, India, Indonesia, New Guinea, Africa, Europe, and throughout America.

Illustrations: C. Gao (ed.) 1996 (Pl. 75, figs. 1–4, as Bryoerythrophyllum dentatum; figs. 11–15, as B. pergemmascens).