FLORA OF VIETNAM Orchidaceae Thelasis pygmaea (Griff.) Blume
N.Vietnam, Bac Kan Prov., Cho Don Distr., Ban Thi Municipality, village Phia Khao, around point 22°16′10′'N, 105°31′01′'E at elevation 700-850 m a.s.l. (Tang Gia mountain). Primary broad-leaved evergreen closed forest on very steep slopes and cliffs near and on tops of rocky ridge composed with solid marble-like stratified limestone. Epiphyte on high trees. Occasional. HAL 4766 22 May 2004