S. Vietnam, Prov. Lam Dong, distr. Lac Duong, municipalite Da Chay, 32.5 km to NE from Dalat city. Closed primary broadleaved mt forest along mt ridge in 5-6 km to NNW from main Bi Dup peak at 1800-1900 m alt. (N 12° 07′, E 108° 41′). Epiphyte on high trees. Sepals and lip olive-yellowish, synsepalum pale green, sepal greenish with purple-brown center and white margin. Not common. VH 3333 29.03.1997 International Botanical Expedition of the U.S.A. National Geographic Society (grant No 5803-96)