Hoa Binh Prov., Lac Son Distr., Ngoc Son Municipality, Khu village, around point 20°26′31”N 105°19′32”E.
Primary broadleaved forest on steep rocky slopes of remnant mountain composed with solid crystalline highly eroded limestone at elevation about 550-650 m a.s.l. Creeping epiphyte on old trees on top of ridge. Not common. CPC 1629b 27 March 2011 Coll.: N.Q.Hieu, L.Averyanov, N.T.Hiep, P.K.Loc, P.V.The, N.T.Vinh, T.B.Ngan, N.Tap, D.D.Dao, V.T.Ha.
Fl. under cultivation in 15 July 2020. Flowers odorless, white, lip apex and operculum very light yellow. Photos. L Averyanov CPC 1629b.2