FLORA OF VIETNAM Polypodiaceae s.l. Pteris decrescens
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 closed evergreen broadleaved forest on steep rocky slopes and cliffs of remnant karst limestone ridge at about 100-200 m a.s.l. Lithophytic fern on shady rocks. Not rare.