Hoa Binh Prov., Tan Lac Distr., Ngo Luong Municipality, Tram Hai Village, coordinate ca. 20°28′04”N 105°16′46”E. In heavily logged evergreen broad-leaved forests on slopes of limestone mts., at elevation about 750-800 m a.s.l. Epiphyte. Not rare. CPC 2028a 1 April 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 September 2012. Flowers light greenish. Photos. Averyanov L.