| Summary: | Saprobic hyphomycetes are highly diverse on plant debris. Over the course of our mycological surveys in southern China, three new <i>Helminthosporium</i> species, <i>H. guanshanense</i> sp. nov., <i>H. jiulianshanense</i> sp. nov. and <i>H. meilingense</i> sp. nov., collected on dead branches of unidentified plants, were introduced by morphological and molecular phylogenetic analyses. Multi-loci (ITS, LSU, SSU, <i>RPB2</i> and <i>TEF1</i>) phylogenetic analyses were performed using maximum-likelihood and Bayesian inference to infer their taxonomic positions within <i>Massarinaceae</i>. Both molecular analyses and morphological data supported <i>H. guanshanense</i>, <i>H. jiulianshanense</i> and <i>H. meilingense</i> as three independent taxa within <i>Helminthosporium</i>. A list of accepted <i>Helminthosporium</i> species with major morphological features, host information, locality and sequence data was provided. This work expands our understanding of the diversity of <i>Helminthosporium</i>-like taxa in Jiangxi Province, China.
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