6. Ulota perbreviseta Dixon & Sakurai 短柄卷叶藓 duan bing juan ye xian
Bot. Mag. (Tokyo) 49: 139. 1935. Ulota japonica var. perbreviseta (Dixon & Sakurai) W. S. Hong & Ando, Theses Catholic Med. Coll. 3: 380. 1959. Type: Japan. Fukui Pref., Sakurai 1070 (lectotype, BM).
Plants small, yellow or brownish green above, black below, in small loose mats. Stems ascending, with erect branches to 8 mm long, simple or branched. Leaves crisped when dry, linear-lanceolate, 2.3–3.4 mm × 0.4–0.6 mm, narrowly long acuminate, canaliculate above, plicate below; margins plane or slightly recurved above; upper and median leaf cells rounded-hexagonal or shortly rectangular, 10–14 µm × 3–8 µm, hyaline, smooth or sometimes with 1–2 small papillae per cell; marginal cells not much differentiated; lower cells elongate-rectangular to sublinear, 16–32 µm × 3–8 µm, gradually becoming wider toward margin, often forming a border of 3–4 rows of rectangular cells, 18–26 µm × 7–11 µm. Autoicous. Inner perichaetial leaves 2.8–3.2 mm long, vaginate at the base, paraphyses absent. Setae 0.8–1.1 mm long; capsules slightly exserted, ovoid to oblong-ovoid, 1.2–1.5 mm × 0.8–1.0 mm, 8-furrowed, constricted or somewhat constricted below the mouth when dry; opercula ca. 0.3 mm long; peristome double; exostome teeth 8, lanceolate, ca. 300 µm long, finely papillose; endostome segments 8, linear, usually less than 1/2 the length of the teeth. Calyptrae mitrate, densely hairy. Spores spherical, 18–22 µm in diameter.