红对齿藓

Didymodon rufus Lor. in Rabenh., Bryoth. Eur. 13: 621. 1863. Barbula rufa (Lor.) Jur., Laubm.-Fl. Oesterr.-Ung. 113. 1882, hom. illeg. Barbula sinensi-fallax C. Müll., Nuovo Giorn. Bot. Ital., n. ser. 3: 100. 1896. Type. China: Shaanxi, Thae-pei-san, P. J. Giraldi 862.

Plants medium-sized to large, to 60 mm high, dark green to reddish brown, in loose or dense tufts. Stems erect or suberect, forked or many-branched; central strand absent. Leaves involute when dry, erect-spreading when moist, ovate-lanceolate, 1.3–1.6 mm × 0.5–0.7 mm, gradually acuminate; margins entire, revolute; costa slender, percurrent to shortly excurrent; upper leaf cells rounded triangular to pentagonal, 8–12 µm × 8–12 µm, strongly thick-walled, with a large, central papilla; basal cells irregularly rectangular, 10–22 µm × 6–10 µm, smooth, hyaline. Dioicous. Setae straight, 1.5–2.0 cm long; capsules ovoid-cylindrical; opercula oblong-conic.

Type. Sikkim: J. D. Hooker s.n. (holotype NY).

Chinese specimens examined: GANSU: He-xi Co., S.-Z. Hu 551 (WUG). HEBEI: Xiao-wu-tai Shan (Mt.), K.-J. Guan 48 (PE); C.-Y. Yang 73, 92 (PE). HEILONGJIANG: Ning-an Co., Jingpo Hu (Lake), C. Gao 9102 (IFSBH). NEI MONGOL: He-lan Shan (Mt.), Z.-G. Tong 1994a (PE). XIZANG: Bo-mi Co., Rawu, M. Zang 2061 (HKAS). YUNNAN: Li-jiang Co., M. Zang 1646 (HKAS); Zhong-dian Co., L.-S. Wang 81–1352 (HKAS).

Habitat: on rocks, soil walls, or forest ground and tree trunks; Distribution: China, Sikkim, Japan, Central Asia, Russia (Siberia), Europe, and North America.

Illustrations: C. Gao (ed.) 1996 (Pl. 61, figs. 9–15, as Barbula asperifolia).