1. Okamuraea brachydictyon (Card.) Nog. 短枝褶藓 duan-zhi zhe xian
J. Hattori Bot. Lab. 9: 10. 1953. Brachythecium brachydictyon Card., Beih. Bot. Centralbl. 17: 34. 1904. Syntypes. Korea: Ouen-San, Faurie 134; Fusan, Faurie 145.
Plants small, brownish green to yellowish green, dull or slightly shiny, in dense mats. Primary stems creeping, up to 3–4 cm long; crowded with short branches; rhizoids abundant; branches erect or pendent, covered with dense leaves, rounded, obtuse at apex, sometimes with branchlets bearing clustering gemmae; flagelliform branches absent. Leaves ovate to ovate-lanceolate, acuminate upward, somewhat plicate; margins plane, entire; costa slender to rather thick, generally ending at 2/3 the leaf length; median leaf cells oval, 12–19 µm × 8–10 µm; upper cells slightly elongate; basal cells short, 8.5–11.0 µm long, sometimes similar to alar cells; alar cells quadrate to subquadrate; branch leaves similar to stem leaves, but smaller. Sporophytes unknown.