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.
Secondary open evergreen broadleaved forest with bamboo on very steep slopes and cliffs of remnant mountains composed with highly eroded crystalline limestone near top of ridge at elev. 200-250 m a.s.l.
Terrestrial fern in open places. Very common.
HLF 878 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.