Ctenitopsis austrosinensis (Christ) C.Chr. et Tardieu
N. Vietnam, Prov. Quang Binh, distr. Minh Hoa, 72 km to NWW from Dong Hoi, municipalite Thong Hoa, vicinities of Yen Son village, limestone massif Ke Bang (N 17°40′ E 105°57′). Broadleaved evergreen closed primary forest on steep slopes and bluffs of limestone mesas at 400-450 m alt. Terrestrial fern with fronds up to 1.2 m lg on rocky steep shadow slopes. Not rare. VH 4775 17.05.1997 International Botanical Expedition of the U.S.A. National Geographic Society (grant No 5803-96)