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<i>Phyllachora</i> (<i>Phyllachoraceae</i>, <i>Phyllachorales</i>) species are parasitic fungi with a wide global distribution, causing tar spots on plants. In this study, we describe three newly discovered species: <i>Phyllachora chongzhouensis</i>, <i>Phyllachora neidongensis</i>, and <i>Phyllachora huiliensis</i> from <i>Poaceae</i> in China. These species were characterized using morphological traits and multi-locus phylogeny based on the internal transcribed spacer region (ITS) with the intervening 5.8S rRNA gene, the large subunit of the rRNA gene (LSU), and the 18S ribosomal RNA gene (SSU). Three known species of <i>P. chloridis</i>, <i>P. graminis</i>, and <i>P. miscanthi</i> have also been redescribed, because, in reviewing the original references of <i>P. chloridis</i>, <i>P. graminis</i>, and <i>P. miscanthi</i>, these were found to be relatively old and in Chinese or abbreviated. In addition, the illustrations were simple. In molecular identification, the ITS sequence is short, while the ITS, LSU, and SSU are incomplete. Therefore, this study provides new important references for the redescription of three known species and provides further evidence for the identification of new taxa.