无疣墙藓

Desmatodon mucronifolius (Schwaegr.) Mitt., J. Proc. Linn. Soc., Bot., Suppl. 1: 37. 1859. Syntrichia mucronifolia (Schwaegr.) Brid., Muscol. Recent. Suppl. 4: 97. 1818 [1819].

Plants small, 4–10 mm high, green or yellowish green, in loose tufts. Stems erect, simple or branched at base. Leaves contorted-curved when dry, spreading when moist, oblong or oblong-obovate, abruptly acute, 2.5–3.5 mm long; margins entire, plane or only slightly recurved near base, bordered by a few rows of thick-walled cells; costa slender, excurrent as a long, yellowish awn; upper leaf cells subquadrate to rounded-hexagonal, 10–21 µm in diameter, smooth, walls more thickened at corners; basal cells elongate-rectangular, smooth, thin-walled. Autoicous. Setae straight, 15–17 mm long, reddish brown; capsules slightly curved, cylindrical, 3.5–4.0 mm long; peristome teeth linear, twisted, reddish brown; basal membrane high, nearly half as long as the teeth; annuli consisting of 2 rows of vesiculose cells, persistent; opercula conic-subulate with a long beak. Spores 13–15 µm in diameter, yellowish green, smooth or finely papillose.

Type. Europe.

Chinese specimens examined: GANSU: Yu-zhong Co., Xing-lung Shan (Mt.), L.-X. Zhen 14 (PE). HEBEI: Bei-tai (Mt.), Q.-W. Wang 950 (PE); Dong-ling (Mt.), K.-J. Guan 192 (PE); Xi-ling (Mt.), Q.-W. Wang 1600 (MO, PE); Wei Co., Y.-C. Zhao 2 (PE). NEI MONGOL: Da-qing Shan (Mt.), Z.-G. Tong 812 (MO, PE); He-lan Co., Z.-G. Tong 2158 (PE). QINGHAI: Gong-he Co., F.-G. Lu 30546 (PE). SHANGHAI: Song-jiang Co., J.-L. Bi 41 (PE). XINJIANG: Urumqi Co., R.-C. Qin 0610 (MO, PE).

Habitat: on rocks, soil in grasslands or on forest ground, often mixed with other mosses; Distribution: China, Mongolia, Japan, Central Asia, Russia, Europe, Africa, and North America.

Illustrations: Zander 1993 (Pl. 88, figs. 10–14).