Four new (Phragmidiaceae, Pucciniomycetes) species from Rosaceae plants in Guizhou Province of China.

In this study, four new species of were proposed based on morphological and molecular characters. In morphology, sp. nov. was distinguished to related taxa by its unique square to diamond-shaped urediniospores; sp. nov. differed from and because of teliospores with fewer cells and shorter pedicels; urediniospores of sp. nov. were bigger than ; and sp. nov. produced bigger urediniospores than . The phylogenetic analyses based on the combination of two loci (ITS and LSU) also supported our morphological conclusion. In the meantime, three previously known species were also described herein.