N. Vietnam, prov. Son La, distr. Moc Chau, municipality Chieng Hac, vicinities of Co Liu village (N 20°51′ E 104°38′). Primary evergreen broadleaved wet mossy forest along rocky tops of remnant karst limestone ridge at 1200-1240 m elev. Epiphyte creeping fern with fronds up to 40 cm lg on mossy trees. Not rare.
NTH 2966 29 May 1999
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)