S. Vietnam, Prov. Ninh Thuan, distr. Ninh Son, municipalite Phuoc Binh in 34 km to NE from Dalat city. Closed primary broadleaved forest along mt ridge between Bi Dup and Gia Rinh mt. mt at 1800-1900 m alt. (N 12° 07′, E 108° 42′). Terrestrial fern on shadow steep canyon slope. Common. VH 3617 03.04.1997 International Botanical Expedition of the U.S.A. National Geographic Society (grant No 5803-96)