N. Vietnam, prov. Ha Giang, distr. Yen Minh, municipality Du Gia, E slopes of Phu Tha Ca mountain system at 1900 m elev. (N 23°56′ E 105°13′). Primary evergreen broadleaved very wet mountain forest on quartzite very steep slopes. Lithophyte fern on shady quartzite cliff. Not common.
CBL 2072 03 May 1999
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)