S. Vietnam, Prov. Lam Dong, distr. Lac Duong, municipalite Da Chay, 40 km to NE from Dalat city. Closed primary very wet broadleaved forest along stream canyon on SW macroslope of Hon Giao mt. ridge at 1600-1700 m alt. (N 12° 11′, E 108° 43′). Epiphyte on high trees. Flowers yellowish-white, lip with purple-violet marks. Common. VH 4403 26.04.1997 International Botanical Expedition of the U.S.A. National Geographic Society (grant No 5803-96)