N. Vietnam, prov. Ha Giang, distr. Yen Minh, municipality Du Gia, E slopes of Phu Tha Ca mountain system at 1700-1800 m elev. (N 23°56′ E 105°13′). Primary evergreen broadleaved very wet mossy cloud forest on quartzite very steep slopes. Lithophyte creeping fern on mossy quartzite cliffs. Rare.
CBL 2144 03 May 1999 International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)