Pseudomegasporoporia margallensis sp. nov. and Microporellus subadustus (Polyporaceae, Basidiomycota) newly described and recorded from Pakistan.

In this study, we describe Pseudomegasporoporia margallensis as a novel species and report Microporellus subadustus as a new record from Pakistan based on morphology and phylogeny. Both genera are firstly reported in the country. Pseudomegasporoporia margallensis sp. nov. is characterized by light brownish gray poroid hymenphore, grayish brown subiculum surface, frequent generative hyphae in the subiculum with abundant clamp connections, and arboriform-branched skeletal hyphae in subiculum and tubes, and it forms a sister lineage of P. nerricola in the phylogeny. This novel taxon, showing 37 nucleotide differences in ITS nrDNA and 10 in LSU nrLSU sequences from P. nerricola, has GenBank accession numbers PP702233, PP702234, PP702235, PP702236, and PP70223, and is registered under MycoBank no. MB853645. This higlights the genetic distinction and importance of molecular identification in fungal taxonomy. The new species and the new record are described with detail illustrations.