2. Ptychomitrium fauriei Besch., J. Bot. (Morot). 12:297. 1898.
Glyphomitrium fauriei (Besch.) Broth., Nat. Pflanzenfam. I (3): 44. 1902.
Ptychomitrium brevisetum Dix. ex Sak., Bot. Mag. Tokyo 53: 248. 1939.
Plants small, to 1 cm high, dark green to blackish green, in loose tufts. Stems simple or sparsely branched; central strand differentiated. Leaves 2.8–3.5 mm long, slightly crisped when dry, spreading to erect-spreading when moist, narrowly lanceolate from a suddenly narrowed ovate base to an obtuse, bluntly acute apex, strongly concave and keeled above; margins erect, entire; costa single, strong, ending below the apex; upper leaf cells small, obscure, irregularly rounded quadrate, 5–6 µm wide, thick-walled; median cells short-rectangular, 7–9 µm x 5–7 µm, thick-walled; basal cells near margins rectangular, 26–39 µm x 11–14 µm, thin-walled; basal juxtacostal cells elongate to narrowly elongate, 35–50 µm x 5–6 µm, thin-walled. Autoicous. Perichaetial leaves similar to upper stem leaves. Setae straight, reddish brown, 3–4 mm long, more or less twisted above; capsules erect, oblong-ovoid to cylindric, yellowish brown, ca. 1 mm long; annuli not well developed; peristome teeth long, linear, forked nearly to the base, finely papillose; opercula with an erect beak. Calyptrae mitrate, nearly covering the entire capsule, plicate, lobed at the base. Spores spherical 10–13 µm in diameter, finely papillose.
Chinese specimens examined: ANHUI: Huang Shan (Mt.), P.-C. Chen 6829 (PE), D.-K. Li 2118 (SHM). JILIN: An-tuo Co., C. Gao 1314 (IFSBH). XIZANG: Cha-yu Co., M.-Z. Wang 12884a (PE). YUNNAN: Bi-jiang Co., M. Zang 5981 (HKAS). ZHEJIANG: Mt. Pu-tuo, D.-K. Li 5708 (SHM); Mt. Jiu-long, Z.-L. Liu & R.-L. Hong 1110 (HSNU).
Habitat: on open rocks in mountains; Distribution: China, Korea, and Japan.
Ptychomitrium fauriei is closely related to P. sinense. Both species have small plants and mitrate calyptrae, which cover almost the entire capsules. Ptychomitrium fauriei differs from P. sinense by having leaves with a suddenly narrowed ovate base and a narrowly lanceolate upper part, which is distinctly keeled and concave. In addition, Ptychomitrium fauriei is not as widely distributed as P. sinense.
Illustrations: Pl. 139, figs. 1–12.