Hydrogonium subcomosum (Broth.) P.-C. Chen, Hedwigia 80: 236. 1941. Hydrogonium laevifolium (Broth. & Yas.) P.-C. Chen, Hedwigia 80: 248. 46 f. 1–2. 1941. Barbula laevifolia Broth. & Yas., Öfvers. Forh. Finska Vetensk.-Soc. 62A(9): 11. 1921. Hydrogonium subpellucidum Mitt. var. angustifolia (Broth.) Hilp., Beih. Bot. Centralbl. 50(2): 629.1933. Barbula subpellucida Mitt. var. angustifolia Broth., Symb. Sin. 4: 43. 1929. Type. China: Sichuan (Setschwan), Yen-yüen Co., Handel-Mazzetti 2529 (holotype H).

Plants medium-sized, to 20(–50) mm high, yellowish green, in dense tufts. Stems erect, loosely foliate, simple or irregularly branched, often radiculose at base. Leaves loosely appressed when dry, erect-spreading when moist, lanceolate to narrowly ovate-lanceolate, ca. 2.5 mm x 0.5 mm, acuminate to acute; margins entire, plane or slightly recurved in lower half; costa stout, percurrent to shortly excurrent as a mucro, seldom ending below apex, coarsely papillose on the dorsal surface; upper leaf cells small, subquadrate, rather thin-walled, obscure, densely covered with C-shaped papillae; basal cells differentiated, often larger, short-rectangular, smooth, hyaline. Gemmae present, club-shaped, in leaf axils. Dioicous. Setae 10–12 mm long, yellowish, sometimes reddish brown; capsules erect, oblong-ovoid; peristome filiform, twisted, densely papillose; opercula conic -rostrate, with a long beak. Spores spherical, green, smooth.

Type. Japan: Kiushiu, Kangawa, Wichura 1400a.

Chinese specimens examined: TAIWAN: E. Matsuda 633, 1284, 1285 (H), A. Yasuda 626 (H); Chan-an Chio, Sharp 1532 (NICH); Chia-yi Co., T. Amano 8769 (NICH); Hwa-lien Co., C.-C. Chuang 5748 (MO). XIZANG: Meng-kong Co., S.-K. Chen 425 (HKAS).

Habitat: on rocks; Distribution: China and Japan.

Illustrations: Pl. 111, figs. 1–9.