N. Vietnam, prov. Ha Giang, distr. Yen Minh, municipality Du Gia, E slopes of Phu Tha Ca mountain system at 1400-1500 m elev. (N 23°56′ E 105°13′). Primary evergreen broadleaved very wet mountain forest on shale very steep slopes. Lithophyte creeping fern in shady place. Common.
CBL 2117 03 May 1999
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)