FLORA OF VIETNAM Polypodiaceae s.l. nthrophium sp.
N. Vietnam, Thai Nguyen prov., Vo Nhai distr., Than Sa municipality, vicinities of Kim Son village (N 21°48′ E 105°54′), 23.3 km to 18° of Thai Nguyen city. Primary broadleaved evergreen dry forest on very steep rocky slopes of karst remnant limestone ridge at elev. 300-450 m a.s.l. Epiphyte on mossy trees in shady place. Not rare.