Son La Prov., Thuan Chau Distr., Muoi Noi Municipality, Sang village, around point 21°18′28”N 103°48′33”E.
Remnants of primary broadleaved evergreen forest on top of remnant mountain composed with solid highly eroded limestone at elevation 1000-1100 m a.s.l.
Epiphyte on old mossy tree on rocky top of mountain. Not rare.
CPC 1820 30 March 2011 Coll.: L.Averyanov, N.T.Hiep, T.B.Ngan.
Fl. in cult 22 March 2016. Photos. L.Averyanov Fl. in cult 4 March 2017. Photos. L.Averyanov