FLORA OF VIETNAM Polypodiaceae s.l. Asplenium rupestre?
Son La Prov., Van Ho Distr., Xuan Nha Municipality, Pu Lau village, territory of Xuan Nha natural reserve.
Remnants of primary and secondary broad-leaved evergreen dry forest on cliffs and on very steep slopes of remnant hill composed by highly eroded stratified dark gray shale limestone at elevation 500-700 m a.s.l. around point 20°40′35.4″N 104°48′14.3″E.
Lithophytic fern on very steep rocky mossy slope near mountain top. Very common.