Dien Bien Prov., Tua Chua Distr., Sin Chai Municipality, around point 22°03′38”N 103°19′56”E. Primary humid evergreen broad-leaved forest on very steep rocky slopes and on tops of remnant mountain composed with highly eroded marble-like solid crystalline limestone at elevation 1350-1500 m a.s.l. Epiphyte. Occasional. CPC 982a/13 14 December 2010 Coll.: L.Averyanov, P.K.Loc, P.V.The, N.T.Vinh.
Fl. under cultivation at June 2013. Flowers white to very light yellowish-green, sepal apices light yellow, lip pure white. Photos.