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Rust fungi taxonomically belonging to Pucciniales (Basidiomycota) are important phytopathogens that cause many significant diseases to agricultural crops and forest trees. Hitherto, ca. 8000 and 1200 species have been reported from worldwide and China, respectively. To investigate and document the diversity of rust fungi in China, we have sampled from 86 natural reserves and national parks in the past several years, and 6627 specimens have been collected. Our identification using both morphological and molecular data assigned 1654 collections to 337 species in 43 genera of 15 families, as cataloged in this paper. Among them, 34 new species are formally described based on their morphological distinctions and phylogenetic relationships. In addition, three new families Endoraeciaceae, Neophysopellaceae and Uromycladiaceae are proposed based on their morphological distinctions, phylogenetic …