3. Buxbaumia symmetricaP.-C.Chen & X.-J. Li 圆蒴烟杆藓 yuan shuo yan gan xian
Acta Phytotax. Sin. 9(3): 279. Pl. 19. 1964. Type: China. Shaanxi, Yu-hsien, Lao-yu, Pa-li-ping, Shih-men-kou, alt. 1800 m, Z.-P. Wei 4731a (holotype HKAS; isotypes MO, PE).
Plants often mixed with other mosses. Male plants not seen. Female plants reduced. Leaves broadly ovate or ovate-elliptic, 0.3–0.4 mm long, usually 4–6 in number, membrane-like, hyaline, sometimes reddish brown, serrate or ciliate at margins; costa absent; leaf cells elliptic or rounded hexagonal. Archegonia 1–2, terminal. Sporophytes usually 11–14 mm high. Setae stout, cygneous, 4.0–4.5 mm long, reddish brown, densely papillose, with hyaline rhizoids at the base; capsules yellowish green or yellowish brown, oblong-ovoid, 5.6–7.0 mm × 1.5–2.0 mm, inclined, nearly symmetric, dorsal and ventral surfaces not differentiated, neck distinct, but short, nodulose; clearly constricted at mouth; peristome double; exostome teeth rather short, reduced; endostome segments white, membrane-like, 16-plicate, pleated cone-shaped, densely papillose; stomata superficial; annuli differentiated; opercula bluntly conic. Calyptrae small, only covering the top of the operculum. Spores yellowish green, spherical or ellipsoid, 6–9 µm in diameter, minutely papillose.