N. Vietnam, prov. Ha Giang, distr. Yen Minh, municipality Du Gia, E slopes of Phu Tha Ca mountain system at 1000-1100 m elev. (N 23°56′ E 105°13′). Primary evergreen broadleaved very wet mountain forest on shale very steep slopes. Lithophyte fern on shady vertical shale cliffs. Not common.
CBL 2048 03 May 1999
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)