N.Vietnam, Bac Kan Prov., Ba Be Distr., Nam Mau Municipality, from Khau Cum to Nam Dai village.Ba Be National Park around point 22026′ 105′'N 1050 36′ 200′'E. Secondary closed evergreen broad-leaved forest on top of remnant mountains composed with crystalline highly eroded marble-like limestone at elevation 350- 531 m a.s.l. Fern 4-5 m hight. . On soil, in shady and wet HLF 575. 21 Dec. 2002.
Coll. Nguyen Tien Hiep, Jacinto Regalado, Duong Van Xy, Bang Tien Sy Grant from Henry Luce Foundation.