N. Viet Nam, Son la Prov., Yen Chau Distr., Muong Lum Municipality, On Oc Village. Primary forest with some timber trees removed along limestone ridgetop, 20°59′06″N, 104°28′46″E at elev. 1468 m. Occasional lithophyte on vertical walls. Plants all green, peduncle green, outer petals transparent, light green, inner petals similar, lip tipped dull pink with raised red-pink ridges, rostellum light green.
4 March 2001. Collectors: D.K. Harder, P.K. Loc, N.T. Hiep, L. V. Averyanov, B. Tan, G.E. Schatz, S. Bodine, DKH 7272. Det.: L. Averyanov, Aug. 2002.