FLORA OF VIETNAM Plants of Phong Nha - Ke Bang National Park Orchidaceae Oberonia sp.
Vietnam, Quang Binh Prov., Minh Hoa Distr., Thuong Hoa Municipality, about 1-1.5 km to SW of Ban On village (17°40′21′'N, 105°58′00E). Ca Xach mountain (17°39′20′'N, 105°57′42′'E).
Primary closed evergreen broad-leaved gnarled stunted forest along rocky ridge composed with solid marble-like highly eroded crystalline limestone at elevation 600-800 m a.s.l.
Epiphyte on tree canopy (Phyllanthus sp., Nageia fleuryi, Pistacia cucphuongensis, Memecylon sp., Alstonia guangxiensis, Garcinia sp., Quercus sp.). Not common.