N.Vietnam, Bac Kan Prov., Ba Be Distr., Nam Mau Municipality, Ba Be National Park around point 22025′34′'N 105036′03′'E. Heavily logged primary closed evergreen dry broad-leaved forest on steep slopes of remnant mountains composed with crystalline highly eroded marble-like limestone at elevation 660 m a.s.l.
Creeping lithophytic fern on open mossy rock outcrops. Common.
HLF 516 21 Dec. 2002.
Coll. Phan Ke Loc, L.Averyanov, Hoang Van Chat, Do Hoang Chung, Nguyen Manh Hung, Vu Hong Van, Nguyen Tien Vinh, Mai Van Xinh. Grant from Henry Luce Foundation.