Amphidium mougeotii (Bruch & Schimp.) Schimp. var. formosicum Card., Beih. Bot. Centralbl. 19 (2): 104. 1905. Gymnostomum curvirostrum Hedw. ex Brid., J. Bot. (Schrader). 1800(1): 273. 1801, nom. illeg. Hymenostylium anoectangioides (C. Müll.) Broth., Nat. Pflanzenfam. I(3): 389. 1902. Trichostomum anoectangioides C. Müll., Nuovo Giorn. Bot. Ital., n. ser. 4: 252. 1897. Type. China: Shaanxi (Schen-si), Lao-y-san, Nov. 1895, P. J. Giraldi s.n. Hymenostylium curvirostrum Mitt., J. Proc. Linn. Soc., Bot., Suppl. 1: 32. 1859, nom. illeg. Hymenostylium curvirostrum var. sinense Card. & Thér., Bull. Acad. Int. Géogr. Bot. 19: 18. 1909. Hymenostylium pellucidum Broth. & Yas., Rev. Bryol. 53: 1. 1926. China: Taiwan, Mt. Vôkô, Yasuda s.n.

Plants medium-sized, usually to 30 mm high, sometimes larger, in dense tufts. Stems erect, often branched. Leaves appressed when dry, erect-spreading when moist, lanceolate, acuminate at the apex; costa stout, percurrent, highly papillose on the back of costa; margins entire, but appearing to be serrulate due to papillose marginal cells; upper leaf cells rounded hexagonal to rounded-quadrate, thick-walled, pluripapillose; basal cells irregularly rectangular, smooth. Sporophytes not seen.

Type. Europe.

Chinese specimens examined: FUJIAN: Jian-ou Co., D.-K. Li 19154 (HKAS, SHM); Wuyi Shan (Mt.), D.-K. Li 11886 (HKAS, SHM). HEBEI: Dong-ling, L.-Q. Yu 329 (MO, PE); Wei Co., Y.-Z. Zhao 1 (PE); Yang-jia-ping, Z.-G. Yang 1365 (PE). HENAN: Luan-chuan Co., Lao-jun Shan (Mt.), J.-X. Luo 287 (PE); Xi-xia Co., J.-X. Luo 289 (PE). JIANGSU: Nanjing City, M. Zang 5701 (HKAS); Yi-xing Co., P.-C. Chen 2160 (PE). JILIN: Chang-bai Shan (Mt.), C. Gao 7667 (IFSBH); Small Sky Lake, Vitt 34784 (ALTA, MO). NEI MONGOL: Da-qing Shan (Mt.), Z.-G. Tong 800, 805 (PE). SHAANXI: Hu Co., P. J. Giraldi 1875 (H); Shun-shan River, P. J. Giraldi 1455 (H); SICHUAN: Kwapi, Handel-Mazzetti 2415 (H); Wen-chuan Co., S.-Z. Liu 1 (PE). TAIWAN: Hua-lien Co., Shevock 15064 (MO); Tailuko Gorge, Chan-an Chio, A.J. Sharp & Evelyn Sharp 1496 (H). XIZANG: Cha-yu Co., M.-Z. Wang 8225 (PE); Long-zi Co., M. Zang 817 (HKAS); Ya-dong Co., M. Zang 120a (HKAS); Zhu-mu-long-ma-feng (Mt. Everest), X.-G. Wang 81 (PE). YUNNAN: Kun-ming City, H.-B. Chen 8326 (HKAS), Koponen 37656 (H); Li-jiang Co., X.-J. Li 8087 (HKAS); Zhong-dian Co., Handel-Mazzetti 4284, 4479 (H), H.-F. Xie 1972, 1976 (PE). ZHEJIANG: western Tian-mu Shan (Mt.), Y.-F. Wang 576 (HSNU).

Habitat: usually on calcareous rocks or cliffs, occasionally on ground or tree bases in forests; also on rocks in glaciers; Distribution: China, Japan, Nepal, Pakistan, India, Russia, Europe, northern Africa, and North America.

Illustrations: C. Gao (ed.) 1996 (Pl. 50, figs. 11–17, as Gymnostomun recurvirostrum).