5. Fabronia matsumurae Besch. 东亚碎米藓 dong-ya sui-mi xian
J. Bot. (Morot) 13: 40. 1899. Type. Japan: Tokyo Pref.
Plants minute, green, glossy, loosely tufted. Stems creeping, irregularly branched; rhizoids in tufts on the ventral surface of stems; branches erect, obtuse at apex. Leaves spirally arranged, often in two rows, ovate, apex short, suddenly acute, apical cell yellowish, 0.5–0.8 mm × 0.4 mm; leaf margins plane, upper margin irregularly serrate with single cell; costa single, weak, ending in the middle of leaf, smooth on the back; leaf cells rhomboidal or elongate-hexagonal, 20–40 µm × 10–13 µm; alar cells quadrate, in several rows. Autoicous. Setae 2–3 mm long, yellowish brown; capsules ovoid, erect, cup-like after broken; opercula with a short beak; peristome absent. Calyptrae cucullate. Spores 14–17 µm in diameter, minutely papillose.