Less is better than more: reassessing the monotypic nature of Irpicodon (Amylocorticiaceae, Basidiomycota)

Within the family Amylocorticiaceae, conspicuous morphological affinities exist among the previously defined species Irpicodon pendulus, Plicaturopsis crispa and Plicatura nivea. With the aid of macro- and micro-morphological characters and phylogenetic evidence based on 3-gene datasets, a comprehensive reassessment of generic boundaries within these taxa was conducted. Upon reviewing the systematic position of the taxa included, the three genera emerged as a well-defined monophyletic clade. Based on the genetic divergence observed, coupled with the robust support for monophyly, similarities in ecological roles, and congruence in macro- and micromorphological characteristics, we suggest a revised genus concept that synonymizes Irpicodon (as well as Plicaturopsis) with the earliest established genus Plicatura.