| Summary: | <i>Chrysoporthe syzygiicola</i> and <i>C. zambiensis</i> are ascomycete tree pathogens first described from Zambia, causing stem canker on <i>Syzygium guineense</i> and <i>Eucalyptus grandis</i>, respectively. The taxonomic descriptions of these two species were based on their anamorphic states, as no sexual states are known. The main purpose of this work was to use whole genome sequences to identify and define the mating-type (<i>MAT1</i>) loci of these two species. The unique <i>MAT1</i> loci for <i>C. zambiensis</i> and <i>C. syzygiicola</i> consist of the <i>MAT1-1-1</i>, <i>MAT1-1-2</i>, and <i>MAT1-2-1</i> genes, but the <i>MAT1-1-3</i> gene is absent. Genes canonically associated with opposite mating types were present at the single mating-type locus, suggesting that <i>C. zambiensis</i> and <i>C. syzygiicola</i> have homothallic mating systems.
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