N. Vietnam, prov. Ha Giang, distr. Yen Minh, municipality Du Gia, E slopes of Phu Tha Ca mountain system at 1800 m elev. (N 23°56′ E 105°13′). Primary evergreen broadleaved very wet mountain forest on quartzite very steep slopes. Terrestrial fern on rocky steep quartzite cliffs. Not common.
CBL 2156 03 May 1999
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)