Weissia cucullifolia Dix. & Sak. in Sak., Bot. Mag. (Tokyo) 53: 63, f. 7. 1939. Weissia platyphylla Broth., Hedwigia 38: 205. 1899, hom. illeg.

Plants small, to 12 mm high, dark green or reddish brown, in dense tufts. Stems erect, usually irregularly branched, densely foliate. Leaves crisped when dry, erecto-patent when moist, narrowly ovate-lanceolate or narrowly ligulate, broadly acute or obtusely pointed, upper lamina often keeled; margins entire, usually plane; costa stout, percurrent or excurrent as a mucro; upper leaf cells rounded-hexagonal, moderately thick-walled, green and obscure, each cell with several large, circular papillae on both surfaces; basal cells slightly elongate, irregularly short-rectangular, smooth, hyaline. Autoicous. Setae 5–7 mm long, yellowish; capsules erect, oblong-ellipsoidal; peristome teeth erect, linear, short, undivided, papillose.

Type. China: Hebei (Hopei), Peitaho, Lichent 11b (BM).

Chinese specimens examined: ANHUI: Huang Shan (Mt.), R.-L. Zhao 4 (HKAS). FUJIAN: Wuyi Shan (Mt.), X.-J. Li 77 (HKAS). HEBEI: Dong-ling, L.-Q. Yu 363 (PE). HEILONGJIANG: Shang-zhi Co., Z.-W. Ao 8551 (HKAS). HENAN: Hui Co., H.-J. Yu 1545 (HKAS). HUNAN: Sang-zhi Co., D.-K. Li 18393 (HKAS, SHM). JIANGSU: Nan-jing City, M. Zang 57010 (HKAS, HSNU). JIANGXI: Lu Shan (Mt.), S.-L. Wang X–0021 (PE). LIAONING: Ben-xi Co., C. Gao s.n. (IFSBH); Feng-cheng Co., C. Gao 1091 (HKAS, IFSBH). NEI MONGOL: Da-qing Shan (Mt.), Z.-G. Tong 792 (PE). NINGXIA: Niu-shou Shan (Mt.), J.-K. Pan 39a (PE). SHANDONG: Tai Shan (Mt.), C. Gao 34080 (HKAS, IFSBH). SHANGHAI: Jin Shan (Mt.), D.-K. Li 977 (PE). SHANXI: Yong-ji Co., Y.-J. Ling 5901 (HKAS). SICHUAN: Mu-li Co., K.-K. Chen 542 (HKAS). YUNNAN: Lv-chun Co., M. Zang 868 (HKAS); Meng-la Co., X.-J. Li 2561 (HKAS). ZHEJIANG: Sui-chang Co., Z.-L. Liu 927 (HSNU).

Habitat: on rocks, forest ground, or tree trunks; also on rocks and soil at roadsides or near streams; Distribution: China, Japan, and Russia.

Illustrations: Pl. 135, figs. 1–4.