Luang Prabang prov., Ngoy distr., Nong Khiew village, Ta Nang Non Mountain around point 20°33′29.2″N 102°36′54.5″E. Secondary semideciduous and evergreen dry forest on very steep rocky mountain slopes composed by solid marble like highly eroded limestone at elev. 600-650 m a.s.l. Epiphyte on old mossy tree on rocky mountain top. Not common. LA-VN 1920 31 March 2017. Coll.: L.Averyanov, N.T.Hiep, N.S.Khang, C.Q.Ngan, T.Maisak, Vichith Lamxay, Koudkeo Phommachanh, Phizar Sayalath, Keooudone Souvannakhoummane. Flowered in 6 August 2019, L. Averyanov, LA–VN 1920.1, flowers yellowish, lip white with purple center of epichile. Photos.