FLORA OF VIETNAM Fern 5 Sp. Northern Vietnam, Ha Giang Prov., Yen Minh Distr., Du Gia municipality, Giang Chu D village (Du Gia Nature Reserve). Primary broad-leaved evergreen closed wet forest on very steep slopes and cliffs of rocky ridges and mesae composed with solid marble-like stratified limestone, around point 22°55?57? N, 105° 08?32?E,1852 m a.s.l. Herb, very common in the top mountain CPC 308 15 May 2010. . Collectors: N. Q.Hieu, N.T. Hiep, N. T. Vinh, H.V.Chung (Funded by Critical Ecosystem Partnership Fund-CEPF through FFI)