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Three species of the rust fungus genus Blastospora, Bl. betulae, Bl. itoana , and Bl. smilacis , have been reported in East Asia. Although their morphological characteristics and life cycles have been investigated, their phylogenetic positions have not been clarified sufficiently. Phylogenetic analysis showed that these three species were included into Zaghouaniaceae of Pucciniales. However, Bl. betulae was phylogenetically distinct from Bl. itoana and Bl. smilacis and different from other genera. Based on this result, and applying recent International Code of Nomenclature decisions/recommendations/requirements, Botryosorus , gen. nov., and Bo. deformans, , comb. nov., were applied for Bl. betulae . Two new combinations, Bl. radiata for Bl. itoana and Bl. makinoi for Bl. smilacis , were also applied. Their host plants and distribution were described based on literature records. Zaghouania yunnanensis , comb. nov., was proposed for Cystopsora yunnanensis as a result of this analysis.