Cao Bang Prov., Bao Lac Distr., Hong An municipality, Mi Lung village.
Primary broad-leaved and mixed humid evergreen forest on very steep slopes and along rocky ridge composed with solid crystalline highly eroded limestone at elevation 1400-1450 m a.s.l. around point 22°49′23.4″N 105°49′54.5″E.
Lithophytic clusterinh fern on open mossy rocks. Very common.