S. Vietnam, Prov. Lam Dong, distr. Lac Duong, municipalite Da Chay, 29 km to NEE from Dalat city. Old open evergreen broadleaved secondary forest rich in primary elements along mt river on W macroslope of Bi Dup mt system at 1450 m alt. (N 12° 08′, E 108° 39′). Epiphyte on old mossy trees over river. Flowers: tepals pale yellow, lip pale yellow with orange keels, base of column red, anther white. Rare. VH 4016 16.04.1997 International Botanical Expedition of the U.S.A. National Geographic Society (grant No 5803-96)