N. Vietnam, Prov. Hoa Binh, Distr. Tung Khe. Primary evergreen mountain forest on vertical rock cliffs near the top of limestone ridge at 750-800 m alt.
Epilite and epiphyte. Flowers white with light brownish lip. Not common.
VH 2444 30.12.1995
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 5094-93)
Participants: L. Averyanov, N.T. Ban, A. Budantzev, L. Budantzev, N.T. Hiep, D.D. Huyen, P.K. Loc, G. Yakovlev