N.Vietnam, Cao Bang Prov., Trung Khanh Distr., Ngoc Khe Municipality, Pac Nga village, around point 22º54'59''N, 106º31'44''E, at elevation 800-850 m a.s.l.
Remnants of primary broad-leaved evergreen and coniferous forest along rocky tops of rocky ridges and mesae composed with light gray solid marble-like highly eroded crystalline limestone.
Epiphyte. Flower tepals dull yellowish, lip brown-purple-violet. Very common.