3. Hydrogonium ehrenbergii (Lor.) Jaeg. 石灰藓 shi-hui xian
Ber. Thätigk. St. Gallischen Naturwiss. Ges. 1877–78: 405 (Gen. Sp. Musc. 2: 669). 1880. Barbula ehrenbergii (Lor.) Fleisch., Musci Frond. Archip. Ind. Exsic. 4: n. 161. 1901. Trichostomum ehrenbergii Lor., Abh. Königl. Akad. Wiss. Berlin 1867: 25. 4 f. 1–6, 5 f. 7–19. 1868. Type. Europe.
Barbula latifolia Broth., Symb. Sin. 4: 43. 1929, hom. illeg. Type. China: Yunnan, Zhong-dian Co., Handel-Mazzetti 6843 (H).
Barbula subpellucida Mitt. var. proligera Broth., Symb. Sin. 4: 43. 1929. Type. China: Sichuan, Hui-li (Quelle) Co., Handel-Mazzetti 2025 (holotype H).
Plants medium-sized to large, 40–80 mm high, soft, bright green, in dense tufts. Stems erect, branched. Leaves soft, contorted when dry, erect-spreading when moist, ovate-ligulate, 2.5–4.0 mm long, blunt to rounded-obtuse or somewhat apiculate, occasionally weakly cucullate at the apex; margins entire, plane or narrowly revolute in the lower half; costa stout, percurrent; upper leaf cells quadrate to hexagonal, thin-walled, smooth or indistinctly mammillose; basal cells laxly oblong, smooth, hyaline. Setae ca. 20 mm long, reddish; capsules erect, ovoid-cylindric; peristome teeth linear, twisted counterclockwise once.