Multigene phylogenetic analyses and morpho-anatomical characterization revealed two new species of Xylariomycetidae from Yunnan, China

During a survey of ascomycetes in Yunnan Province, China, two new wood-inhabiting fungi were collected and identified. These novel species are described based on morphological characteristics and phylogenetic analyses of the ITS, LSU, <i>rpb2</i>, and <i>tef1</i> loci. The newly identified species are designated as <i>Amphisphaeria zhaotongensis</i> and <i>Pallidoperidium yunnanense</i>, belonging to the families Amphisphaeriaceae and Pallidoperidiaceae, respectively. These species are confirmed as distinct from their close relatives through phylogenetic analyses and morpho-anatomical comparison. The study provides detailed morphological descriptions, illustrative representations, and a phylogenetic tree, all of which contribute to the taxonomic positioning of these novel species.