N. Vietnam, prov. Ha Giang, distr. Dong Van, municipality Ho Quang Phin, vicinities of Ta Xa village, 14-16 km to SSW of Dong Van town (N 23°16′ E 105°22′). Secondary open broadleaved wet forest with remnants
of primary elements on steep slopes and bluffs of karst remnant limestone ridge at 1300-1400 m elev. Lithophyte fern in shady crevices of vertical cliffs. Not common.
CBL 1721 28 April 1999
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)