FLORA OF VIETNAM
Polypodiaceae s.l. Phu Tho Prov., Tan Son Distr., Xuan Son Municipality, Du village, Nhon Mountain, around mountain top, point 21°06′51”N 104°57′34”E.

Remnants of primary evergreen primary forest on very steep slopes and cliffs composed with solid highly eroded marble-like limestone at elevation about 600 m a.s.l.

Epiphytic vine to 3 m long in shady place on very steep rocky shady slope. Occasional.

HAL 12821 19 February 2009
Coll.: L.Averyanov, P.K.Loc, N.T.Vinh, L.T.Son.