Dien Bien Prov., Tua Chua Distr., Sin Chai Municipality, around point 22°03′38”N 103°19′56”E.
Primary humid evergreen broad-leaved forest on very steep rocky slopes and on tops of remnant mountain composed with highly eroded marble-like solid crystalline limestone at elevation 1350-1500 m a.s.l.
Lithophytic fern on vertical mossy shady cliff. Common.
CPC 987 14 December 2010 Coll.: L.Averyanov, P.K.Loc, P.V.The, N.T.Vinh.