Hoa Binh Prov., Lac Son Distr., Tu Do Municipality, Mon village, around point 20°24’52”N 105°19’41”E. Secondary evergreen dry broad-leaved forest on steep rocky slopes of remnant mountain composed with highly eroded marble-like solid crystalline limestone at elevation about 300 m a.s.l. Clustering epiphyte on tall tree. Tepals whitish, epichile yellow. Very common.