Vietnam, Quang Tri Prov., Huong Hoa Distr., Huong Phung Municipality, vicinities of Sa Mui pass, around point 16°48′36″N 106°34′44″E at elevation about 1400-1500 m a.s.l.
Primary broad-leaved evergreen montane cloudy forest along main ridge of Sa Mui Mountain.
Epiphyte on vertical shady cliffs. Flowers yellow with red-brownish marks, lip white. Rare.
HLF 6509 1 April 2006. Photo.
Coll. N.T.Hiep, L.Averyanov, P.K.Loc, P.V.The, N.S.Khang, P.H.Duc, L.T.Son, S.Bounphanmy, T.K.Ratana, O.Sonliya, T.Q.Dang, N.V.Hien, H.T.N.Trang, L.T.Chau. Grant from Henry Luce Foundation.