Vietnam, Quang Binh Prov., Quang Ninh Distr., Truong Son municipality, around Chan Trong village at 17°10′49″N 106°29′22″E.
Secondary dry broad-leaved forest on tops and steep slopes of highly eroded karst limestone mountain composed with gray solid marble limestone allied to Long Dai River, at elevation 300-400 m a.s.l.
Terrestrial and lithophytic fern on shady rocky slope along streamlet. Common.
HAL 11533 13 April 2008 Coll.: L.Averyanov, P.K.Loc, N.T.Vinh, N.S.Khang