Cao Bang Prov., Nguyen Binh Distr., Ca Thanh Municipality, Cao Lu village, around point 22°42′47.7″N, 105°51′50.8″E. Primary coniferous forest with Pseudotsuga sinensis along highly eroded rocky limestone ridge at elevation about 1300 m a.s.l. Epiphyte on mossy tree in shady place along rocky ridge. Occasional. 4 October 2013 CPC 5414a / TM 1037 L.Averyanov, N.T.Hiep, L.M.Tuan, N.S.Khang, T.Maisak, L.Osinovets
Fl. in 22 June 2015 and in 5 June 2016. Sepals and petals greenish with dirty purple marks, lip velvety dark violet.