2. Ptychomitrium fauriei Besch. 东亚缩叶藓 dong-ya suo-ye xian
J. Bot. (Morot) 12: 297. 1898. Glyphomitrium fauriei (Besch.) Broth., Nat. Pflanzenfam. I (3): 44. 1902. Type. Japan.
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 × 5–7 µm, thick-walled; basal cells near margins rectangular, 26–39 µm × 11–14 µm, thin-walled; basal juxtacostal cells elongate to narrowly elongate, 35–50 µm × 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.