FLORA OF VIETNAM Polypodiaceae s.l. Colysis tshusangensis ?
N. Vietnam, Thai Nguyen prov., Dong Hy distr., Tan Long municipality, vicinities of Mo Ba village (21°46′26′'N, 105°52′25′'E). Primary wet broad-leaved evergreen closed forest (with Burettiodendron hsienmu as a main dominant) on remnant highly eroded limestone ridge at elev. 400-550 m a.s.l. Lithophyte and occasional epiphyte at base of trees in shady places. Very common.