Diplazium clivicolum (Polypodiales, Athyriaceae), a new fern species from southern Yunnan, China

A new species in Athyriaceae, <i>Diplaziumclivicolum</i> (section Anisogonium) is described and illustrated from southern Yunnan, China. <i>Diplaziumclivicolum</i> exhibits the greatest morphological similarity to <i>D.incomptum</i>, particularly in lamina division, but can be reliably differentiated, based on lamina width and lobe shape. Molecular phylogenetic analysis demonstrates that the new species is closely related to <i>D.petiolare</i>, despite low morphological concordance. This study focuses on comparing the morphological characteristics of these three species.