1. Chionostomum hainanenseB. C. Tan & Y. Jia 海南花锦藓 hai nan hua jin xian
J. Hattori Bot. Lab. 86: 34. f. 8: 5–11. 1999. Type: China. Hainan, Mt. Wuzhi, on bamboo branches, Fudan Biology Department 2 (holotype PE; isotype FH).
Plants large, equally branched in lax clusters; branches 1.0–1.5 mm long, 2–3 mm wide. Leaves imbricate to erect, oblong to lanceolate, deeply concave, 3.0–3.5 mm × ca. 0.75 mm, slightly plicate, acuminate or acute; margins entire, slightly reflexed, weakly denticulate near apex; leaf cells narrowly elongate to linear, 55–80 mm long, pitted, gradually becoming shorter toward apex; alar region consisting of a group of large, colored, thick-walled, quadrate or rectangular cells arranged in several rows. Autoicous. Inner perichaetial leaves ovate to lanceolate, small, 2.0–2.5 mm long, acuminate, serrate at apex; alar cells not differentiated. Perigonia small, located in lower perichaetia; perigonial leaves small, ovate, ca. 1 mm long. Setae up to 3 mm long; capsules long cylindrical, more than 2 mm long; opercula long rostrate; exothecial cells clearly collenchymatous; exostome teeth reflexed when moist, not cross-striate; endostome greatly reduced, with narrow segments only.