FLORA OF VIETNAM Polypodiaceae s.l. Asplenium ensiforme Wall. ex Hook. & Grev.
N.Vietnam, Thanh Hoa Prov., Ba Thuoc Distr., Thanh Son Municipality, middle part of Pu Luong range around point 20°28′14′'N, 105°05′34′'E. Primary evergreen seasonal broad-leaved closed submontane forest on basalt along main ridge at elev. 1450-1550 m. Lithophyte on vertical cliff. Abundant.