FLORA OF VIETNAM Polypodiaceae s.l. Microsorum aff. fortunei (T. Moore) Ching N.Vietnam, Thanh Hoa Prov., Ba Thuoc Distr., Thanh Son Municipality, SW macroslope of middle part of Pu Luong range around point 20°28′30′'N, 105°05′16′'E. Primary evergreen seasonal broad-leaved closed submontane forest on basalt at elev. 1500-1550 m. Creeping lithophyte. Very common.