FLORA OF VIETNAM Polypodiaceae s.l. Adianthum gravesii N.Vietnam, Bac Kan Prov., Cho Don Distr., Ban Thi Municipality, village Phia Khao, Lung Li valley, around point 22°16′10′'N, 105°31′01′'E, Cot Moc mountain at elevation 800-900 m a.s.l.
Primary broad-leaved evergreen closed forest on very steep slopes and cliffs near tops of rocky ridge composed with solid marble-like stratified limestone.
Lithophytic fern on wet travertine deposits on vertical shady cliff. Very common. Co-dominant of herbaceous travertine communities.