FLORA OF VIETNAM Polypodiaceae s.l. Diplopterygium blotianum (C. Chr.) Nakai
N.Vietnam, Thanh Hoa Prov., Ba Thuoc Distr., Thanh Son Municipality, middle part of Pu Luong range, rocky isolated basalt peak on E macroslope of main ridge at point 20°28′32′'N, 105°05′35′'E. Primary evergreen seasonal broad-leaved closed submontane forest thickets on very steep slopes and on the peak top at elev. 1600 m. Fern with climbing vine fronds up to 2-4 m lg in open cliff. Very common.