N.Vietnam, Bac Kan Prov., Cho Don Distr., Ban Thi Municipality, Cho Dien village, Then Su mt., 22°14′28′'N 105°29′50′'E.
Heavily logged primary closed evergreen wet broadleaved forest on very steep slopes and cliffs of remnant mountains composed with highly eroded crystalline limestone near top of ridge at elev. 250-350 m a.s.l.
Epiphyte. Common.
HLF 873 26 Dec. 2002.
Coll. Phan Ke Loc, L.Averyanov, Nguyen Anh Duc, To Van Thao, Mai Van Xinh, Nguyen Tien Vinh. Grant from Henry Luce Foundation.