Quang Binh Prov., Minh Hoa Distr., Thuong Hoa municipality, environs of Mo O O O village, around point 17°40’03.6”N 105°55’08.5”E. Dense broad-leaved closed forest along highly eroded rocky limestone ridge at elevation about 500 m a.s.l. Epiphyte on tall trees. Tepals yellow with two purple-brown stripes, lip yellow. Very common.