FLORA OF VIETNAM
Polypodiaceae
Onichium sp.?

Cao Bang Prov., Nguyen Binh Distr., Ca Thanh Municipality, Cao Lu village, around point 22°42′47.7″N, 105°51′50.8″E.

Primary coniferous forest with Pseudotsuga sinensis along highly eroded rocky limestone ridge at elevation about 1300 m a.s.l.

Lithophytic fern on vertical shady cliff. Not common.

4 October 2013 CPC 5411
L.Averyanov, N.T.Hiep, L.M.Tuan, N.S.Khang, T.Maisak, L.Osinovets