Thua Thien – Hue Prov., Nam Dong Distr., Thuong Lo Municipality, along Cha Mang stream, around point 16°07′57″N 107°44′16″E.
Primary evergreen broad-leaved lowland forest on very steep hill slopes and along mountain ridge composed with stratified shale and sandstone at elev. about 450-550 m a.s.l.
Lithophyte on shady mossy boulders. Not common.
HAL 10920 5 Apr. 2007. Coll.: L.Averyanov, Phan Ke Loc, A.Averyanova, N.D.Phuong, L.V.Hung.