FLORA OF VIETNAM Orchidaceae Callostylis rigida Blume
N.Vietnam, Bac Kan Prov., Cho Don Distr., Ban Thi Municipality, village Phia Khao, around point 22°16′58′'N, 105°31′20′'E at elevation 800-900 m a.s.l. (Lung Chang and Lung Li mountains).
Primary broad-leaved evergreen closed and coniferous (with Pinus kwangtungensis) forest on very steep slopes and cliffs along tops of rocky ridge composed with solid marble-like stratified limestone.
Creeping epiphytic vine 1.5-2 m long. Very common.