N. Vietnam, Prov. Quang Binh, distr. Minh Hoa, 72 km to NWW from Dong Hoi, municipalite Thong Hoa, vicinities of Yen Son village, limestone massif Ke Bang (N 17°40′ E 105°57′). Primary evergreen closed broadleaved forest on steep slopes and bluffs of limestone mesas at 450-550 m alt. Chlorophyll less saprophyte herb up to 15 cm hg on dry steep rocky slopes. Flowers white, lip with yellow central callus. Rare. VH 4650 16.05.1997 International Botanical Expedition of the U.S.A. National Geographic Society (grant No 5803-96)