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Alternaria brasiliensis sp. nov., was isolated from leaves of common bean, Phaseolus vulgaris L., showing punctiform non concentric leaf spots of brown color. Besides the symptomatological differences, the new Alternaria species presents distinct type of arrangement of conidia chain, body and beak size. The disease was observed in Montanha county, State of Espirito Santo, Brazil, but not yet reported in the literature. The causal agent of the disease is now described by the first time. The epithet used here is referring to the country where the species has been found. [ABSTRACT FROM AUTHOR]