FLORA OF VIETNAM Polypodiaceae s.l. Asplenium filiforme Kaulf.
Cao Bang Prov., Bao Lac Distr., Dinh Phung municipality, Ban O village.
Primary mixed and coniferous evergreen humid forest with (Pinus sp., Pseudotsuga sinensis, Podocarpus neriifolius) on very steep slopes and on mountain tops composed by solid highly eroded limestone at elevation 1200-1300 m a.s.l. around point 22°45′24.8″N 105°46′47.9″E.
Lithophyte on mossy rocks in shady places on mountain tops. Very common.