N. Vietnam, prov. Ha Giang, distr. Yen Minh, municipality Du Gia, E slopes of Phu Tha Ca mountain system at 1900-2000 m elev. (N 23°56′ E 105°13′). Primary evergreen broadleaved very wet mossy cloud forest on quartzite very steep slopes. Terrestrial fern on steep slope. Not rare.
CBL 2151 03 May 1999
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)