Combined dataset and ML tree

<i>Boeremia</i> was established to accommodate phoma-resembling fungi.<i> </i>Its species occur in terrestrial ecosystem as endophytes, saprobes and pathogens, except one species that was reported from a marine ecosystem. <i>Boeremia</i> species are characterized by hyaline, thin-walled, and aseptate (occasionally 1(–2)-septate) conidia that are variable in shape, and hyaline, straight or slightly curved, thick-walled, and 1-septate ascospores that are usually constricted at the septum. In the past, host associations were used to delimit <i>Boeremia</i> species. However, since <i>Boeremia</i> taxa have overlapping morphological characters and are cryptic, it renders taxonomic identification arduous. Therefore, the use of other approaches including multi-gene phylogenetic analyses are imperative. Recommended DNA markers for species delineation are the internal transcribed spacer (ITS, nuclear rDNA consisting of ITS1-5.8S-ITS2) and large subunit (28S, D1–D2 domains of nuclear 28S rDNA) loci, and the genes for actin (<i>ACT1</i>), beta-tubulin (<i>TBB1</i>), RNA polymerase 2 (<i>RPB2</i>) and translation elongation factor 1α (<i>TEF1</i>). Here, we used a biphasic approach that incorporates the morphological and phylogenetic species concepts to establish a new taxon (<i>Boeremia albae</i>), and a new host and geographical record (<i>B. maritima</i>) associated with leaf spots of <i>Morus alba</i> (<i>Moraceae</i>) in northern Thailand. By providing sequence data for three additional gene regions, our phylogenetic analyses impart a stable phylogenetic placement of the ex-type strain of <i>B. maritima</i>, as illustrated. This is the first study that reports <i>Boeremia</i> species from <i>Morus alba</i>, and <i>B. maritima</i> from a terrestrial habitat.