Introducing two new genera, <i>Paivomyces gen. nov.</i> and <i>Pseudoselenophoma gen. nov.</i>, in <i>Saccotheciaceae</i> (<i>Dothideales</i>)

Members of the family Saccotheciaceae are found in various environments and have different lifestyles. While exploring Mimosa tenuiflora -associated endophytic fungi in the Caatinga dry forest in Brazil, the isolates were initially identified as aureobasidium-like fungi. Based on morphological features and phylogenetic analyses using ITS, LSU, tub2 , rpb2 , and tef1 gene sequences, these endophytes were placed within a distinct clade in Saccotheciaceae , differing from the genera currently accepted in the family. Here, we describe a new genus, Paivomyces gen. nov. (including Paivomyces mimosae sp. nov. ). Additionally, during our phylogenetic analyses, we observed that Selenophoma australiensis , described from leaves of Eucalyptus mineata in Australia, could be treated as a unique lineage among the genera in the family Saccotheciaceae . Herein, we introduce Pseudoselenophoma gen. nov. (including Pseudoselenophoma australiensis comb. nov. ) to accommodate the species. Our findings improve our understanding of the fungal diversity in the Caatinga dry forest in Brazil and clarify the phylogenetic lineages of Saccotheciaceae .