S. Vietnam, Prov. Lam Dong, distr. Lac Duong, municipalite Da Chay, 40 km to NE from Dalat city. Closed primary evergreen broadleaved wet mt forest on SW macroslope of Hon Giao mt. ridge at 1500-1650 m alt. (N 12° 11′, E 108° 43′). Epiphyte on mossy stems of old trees over river. Flowers white, anther deep purple. Not rare. VH 4410 26.04.1997 International Botanical Expedition of the U.S.A. National Geographic Society (grant No 5803-96)