Magnolia Press, Phytotaxa, 2(514), p. 158-166, 2021
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Thirty-seven Phyllachora specimens were collected in China and examined for morphological characteristics. A molecular phylogenetic analysis based on a combined sequence dataset of ITS and LSU was also undertaken. Phyllachora cephalostachyi sp. nov. on Cephalostachyum pergracile is described based on its distinct phylogenetic relationships and a comparison of its morphological characteristics with known Phyllachora species on bamboo. Our results indicate a high species diversity of Phyllachora on bamboo in China. A full description and colour photographs of micro-characters are provided for the new species. A phylogenetic tree to show placement of the new species, and a table to compare morphology of the Phyllachora species reported on bamboo are also provided.