8. Hydrogonium majusculum (C. Müll.) P.-C. Chen 大叶石灰藓 da-ye shi-hui xian
Hedwigia 80: 242. 1941. Barbula majuscula C. Müll., Nuovo Giorn. Bot. Ital., n. ser. 5: 182. 1898. Type. China: Shaanxi (Schen-si), Lao-y-huo, Schan-gen-ze, March 1897, P. J. Giraldi 1825 (isotype H).
Plants rather large, to 50 mm high, yellowish green, in loose tufts. Stems erect, thick, mostly branched, radiculose at the base. Leaves contorted when dry, erect-spreading when moist, ovate-lanceolate, broader at the base, gradually acuminate; margins entire, plane in the upper half, revolute in the lower half; costa stout, yellowish brown, usually shortly excurrent; upper leaf cells quadrate to hexagonal, ca. 10–12 µm wide, thin-walled, papillose; basal cells rectangular, somewhat hyaline. Gemmae usually present in leaf axils, consisting of 8–12 cells, spindle-shaped or filiform. Sporophytes not seen.