Son La Prov., Mai Son Distr., Hat Lot town, around point 21°13′05”N 104°06′44”E. Secondary evergreen dry open 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 550-650 m a.s.l. Clustering epiphyte on gnarled trees on top of mountain. Occasional CPC 1156a/01 21 December 2010 Coll.: L.Averyanov, P.K.Loc, P.V.The, N.T.Vinh. Fl. in cult. at 28 March 2018 Flowers yellowish. Photos. L.Averyanov.