硬叶对齿藓

Barbula rigidula (Hedw.) Mild., Bryol. Siles. 118. 1869, hom. illeg.

Plants small to medium-sized, 10–20 mm high, dark green to yellowish green, in dense tufts. Stems erect, branched. Leaves appressed when dry, reflexed to squarrose when moist, triangular or ovate-lanceolate, gradually acuminate at the apex; margins entire, revolute; costa stout, percurrent; upper leaf cells rounded hexagonal, thick-walled, pluripapillose; basal cells shortly rectangular, smooth. Gemmae often present, multicellular.

Type. Europe.

Chinese specimens examined: GANSU: Lan-zhou City, L.-L. Jin 61 (PE); Yu-zhong Co., L.-X. Zeng 17b (PE). HEBEI: Bei-tai, Q.-W. Wang 931 (PE). HENAN: Feng-huang Shan (Mt.), D.-Z. Tu 1602 (HKAS). JIANGSU: Jia-ding Co., S.-M. Xu 263 (PE). JILIN: Chang-bai Shan (Mt.), C. Gao 7203 (HKAS, IFSBH). NEI MONGOL: Ha-la-wu, Z.-G. Tong 1975 (PE); He-lan Shan (Mt.), Z.-G. Tong 1249a, 1925 (PE). QINGHAI: Xing-hai Co., F.-G. Lu 25 (HKAS), Y.-X. Wu 276 (PE). SHAANXI: P. J. Giraldi 932 (PE). SICHUAN: Yan-yuan (Yenyuan) Co., Handel-Mazzetti 4292, 6820 (H). XINJIANG: He-jing Co., S. He 951219 (MO). XIZANG: Ji-long Co., S.-K. Chen 324 (HKAS); Mo-tuo Co., Y.-G. Su 2347 (HKAS); Ran-wu (Rawu), M. Zang 2050a (HKAS); Zhu-mu-lang-ma-feng (Mt. Everest), X.-G. Wang 84, 93 (PE). YUNNAN: Kun-ming City, Handel-Mazzetti 231, 352 (H), X.-J. Li 3047 (HKAS). Li-jiang Co., Handel-Mazzetti 4292, 6820 (H), X.-J. Li 81–452 (HKAS); Ning-lang Co., X.-J. Li 81–486 (HKAS); Teng-chong Co., X.-J. Li 204 (HKAS); Xi-shuang-ban-na, X.-J. Li 3203 (HKAS); Zhong-dian Co., Handel-Mazzetti 3245 (H), X.-J. Li 81–1123 (HKAS).

Habitat: on rocks in alpine regions or on soil in grasslands; Distribution: China, central and western Asia, Russia (Siberia), Europe, northern Africa, North and South America.

Illustrations: C. Gao (ed.) 1996 (Pl. 64, figs. 1–4, as Barbula rigidula).