N. Vietnam, Son La prov., Moc Chau distr., Long Luong municipality, near Sang Cai village (20°45′51′'N, 104°51′26′'E). Primary wet broad-leaved evergreen and semideciduous mossy forest on slopes of remnant limestone highly eroded ridge at elev. 1300-1400 m a.s.l. Epiphyte and lithophyte with pendent shoots up to 0.5 m lg. Not rare.