N. Vietnam, Prov. Hoa Binh, Distr. Mai Chau, subdistr. Pa Co, near 3 km to NE of Pa Co village. Primary evergreen mountain forest on cliffs of limestone ridge at 1100 m alt.
Epilite. Flowers white, tepals sometime with pink tips, lip white with yellow epichile and purple strips on sidelobes. Abundant on and near top of ridges.
VH 2435 27.12.1995
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