Pteris trifoliolata (Pteridaceae), a new brake fern species from karst area in Guangxi, China

Pteris trifoliolata H.J. Wei, a new species of Pteridaceae from karst area in Guangxi, China, is described and illustrated. The new species resembles P. nanlingensis R.H. Miao by its short creeping rhizome, dimorphic fronds and oblong-lanceolate pinnae, but can be distinguished from the latter by the number and size of pinnae, and the degree of frond dimorphism.