Orchidaceae Juss. Cleisostoma williamsonii (Reichenb.f.) Garay S. Vietnam, Prov. Kontum. Primary (?) evegreen dry forest on top of ridge at 1400 m alt. on W slope of Ngoc Linh mountain system above Ngoc Linh village. Epiphyte, especially on Quercus and Lithocarpus sp. Flowers white (old yellowish) with purple marks on the lip. Abundant. VH 1181 04.04.1995 International Botanical Expedition of the U.S.A. National Geographic Society (grant No 5094-93)
Participants: L. Averyanov, N.T. Ban, N. Q. Binh, A. Budantzev, L. Budantzev, N.T. Hiep, D.D. Huyen, P.K. Loc, N.X. Tam, G. Yakovlev