Dien Bien Prov., Muong Cha Distr., Mua Ngai Municipality, around point 21°52′19”N 103°10′01”E. Remnants of primary 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 1150-1250 m a.s.l. Epiphyte on old mossy trees near top of ridge. Common. CPC 1088a/5 18 December 2010 Coll.: L.Averyanov, P.K.Loc, P.V.The, N.T.Vinh.
Fl. under cultivation at 20 September 2013. Sepals and petals brightly yellow, lip yellow with chestnut central spot. L.Averyanov.