N. Vietnam, prov. Cao Bang, distr. Tra Linh, municipality Luu Ngoc, vicinities of Lung Mu village (N 22°47′ E 106°18′), about 14 km from Cao Bang town to the N. Secondary evergreen broadleaved closed forest on steep slopes of foothills of remnant limestone ridge at 650 m alt. Terrestrial fern with fronds up to 1.5 m lg in shadow slopes. Common.
CBL 1165 13 Dec. 1998
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)