3. Ptychomitrium formosicum Broth. & Yas. in Broth. 台湾缩叶藓 tai-wan suo-ye xian
Ann. Bryol. 1: 16. 1928. Type. China: Taiwan, Tai-tung Co., J. Suzuki s.n. (lectotype H-BR); Mt. Dai-bu, A. Yasuda s.n. (syntype H-BR).
Plants medium-sized to large, slender, to 2–6 cm high, yellowish green above, dark green to reddish brown below, in loose tufts. Stems branched; central strand well developed. Leaves 5.0–5.5 mm long, crisped when dry, spreading when moist, linear-lanceolate from an oblong, plicate base, keeled above, acute or acuminate at the apex; margins revolute on one side below, strongly and remotely toothed above, each tooth consisting of several cells; costa single, strong, percurrent; upper leaf cells irregularly subquadrate, 5–8 µm wide, with slightly thickened walls; median cells short-rectangular, 10–15 µm × 5–7 µm, with sinuose walls; basal cells near margins short-rectangular to oblong-rectangular, 15–26 µm × 8–10 µm, with thin, straight walls; basal juxtacostal cells elongate to linear-elongate, 30–40 µm × 4–5 µm, with sinuose walls. Autoicous. Perichaetial leaves similar to upper stem leaves. Setae elongate, (8–)10–15 mm long, straight, yellowish brown, twisted above; capsule erect, oblong-ellipsoid, yellowish brown, 1.3–1.5 mm long; annuli well developed, consisting of two rows of thick-walled cells; peristome teeth reddish brown, linear-lanceolate, forked nearly to the base, densely and finely papillose; opercula with a long, erect beak. Calyptrae mitrate, reaching to the middle of capsules, longitudinally plicate, lobed at the base. Spores small, spherical, 8–10 µm in diameter, finely papillose.