大对齿藓

Geheebia gigantea (Funck) Boul., Musc. France 395. 1884. Didymodon levieri Broth. in Levier, Nuovo Giorn. Bot. Ital., n. ser. 13: 256. 1906. Didymodon subrufus Broth., Symb. Sin. 4: 38. 1929. Type. China: Sichuan (Setschwan), Yan-yuan (Yenyuan) Co., Handel-Mazzetti 2353 (holotype H).

Plants large to robust, 12–20 cm high, dark green to reddish brown, in loose tufts. Stems erect, usually branched. Leaves contorted when dry, strongly squarrose when moist, triangularly broad-ovate at the base, narrowly lanceolate toward to the apex; margins entire, revolute in the lower half, somewhat undulate in the upper half; costa slender, percurrent, reddish brown; upper leaf cells triangular to pentagonal, strongly thick-walled, with 1 to several low papillae; basal cells narrowly rectangular, thick-walled, porose, smooth.

Type. Europe.

Chinese specimens examined: HENAN: Song Co., J.-X. Luo 394a (PE); Xi-xia Co., J.-X. Luo 272 (PE). SHAANXI: Hu Co., P. J. Giraldi 1578 (H), Z.-P. Wei 4570 (HKAS); Tai-bai Shan (Mt.), Z.-X. Peng 41 (HKAS). SICHUAN: Lu-ding Co., Y. Xuan 17835 (HKAS); Wen-chuan Co., J.-X. Luo 3537 (PE). XIZANG: Mo-tuo Co., Y.-G. Su 899, 2440 (HKAS). YUNNAN: Li-jiang Co., Yu-long Shan (Mt.), Handel-Mazzetti 5314 (H), Q.-W. Wang 3971 (MO, PE), X.-J. Li 81–457 (HKAS); Yi-liang Co., X.-J. Li 4498 (HKAS); Zhong-dian Co., X.-J. Li 81–993 (HKAS).

Habitat: on rocks in shade, thin soil over rocks, soil in grassland or on rotten trees; Distribution: China, Sikkim, Japan, Europe, and North America.

Illustrations: C. Gao (ed.) 1996 (Pl. 62, figs. 15–18, as Barbula gigantea).