N. Vietnam, prov. Ha Giang, distr. Yen Minh, municipality Du Gia, E slopes of Phu Tha Ca mountain system at 1500 m elev. (N 23°56′ E 105°13′). Primary evergreen broadleaved very wet mountain forest on shale very steep slopes. Lithophyte fern on shady shale rocks. Not rare.
CBL 2100 03 May 1999
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)