S. Vietnam, Prov. Ninh Thuan, distr. Ninh Son, municipalite Phuoc Binh, 37 km to NE from Dalat city. Closed primary broadleaved mt forest on E macroslope of Gia Rinh mt. ridge at 1700-1800 m alt. (N 12° 06′, E 108° 43′). Terrestrial fern on dry open stream slopes. Very rare. VH 3491 01.04.1997 International Botanical Expedition of the U.S.A. National Geographic Society (grant No 5803-96)