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Hyphodontia sensu lato, belonging to Hymenochaetales , accommodates corticioid wood-inhabiting basidiomycetous fungi with resupinate basidiocarps and diverse hymenophoral characters. Species diversity of Hyphodontia sensu lato has been extensively explored worldwide, but in previous studies the six accepted genera in Hyphodontia sensu lato, viz. Fasciodontia , Hastodontia , Hyphodontia , Kneiffiella , Lyomyces and Xylodon were not all strongly supported from a phylogenetic perspective. Moreover, the relationships among these six genera in Hyphodontia sensu lato and other lineages within Hymenochaetales are not clear. In this study, we performed comprehensive phylogenetic analyses on the basis of multiple loci. For the first time, the independence of each of the six genera receives strong phylogenetic support. The six genera are separated in four clades within Hymenochaetales : Fasciodontia , Lyomyces and Xylodon are accepted as members of a previously known family Schizoporaceae , Kneiffiella and Hyphodontia are, respectively, placed in two monotypic families, viz. a previous name Chaetoporellaceae and a newly introduced name Hyphodontiaceae , and Hastodontia is considered to be a genus with an uncertain taxonomic position at the family rank within Hymenochaetales . The three families emerged between 61.51 and 195.87 million years ago. Compared to other families in the Hymenochaetales , these ages are more or less similar to those of Coltriciaceae , Hymenochaetaceae and Oxyporaceae , but much older than those of the two families Neoantrodiellaceae and Nigrofomitaceae . In regard to species, two, one, three and 10 species are newly described from Hyphodontia , Kneiffiella , Lyomyces and Xylodon , respectively. The taxonomic status of additional 30 species names from these four genera is briefly discussed; an epitype is designated for X. australis . The resupinate habit and poroid hymenophoral configuration were evaluated as the ancestral state of basidiocarps within Hymenochaetales . The resupinate habit mainly remains, while the hymenophoral configuration mainly evolves to the grandinioid-odontioid state and also back to the poroid state at the family level. Generally, a taxonomic framework for Hymenochaetales with an emphasis on members belonging to Hyphodontia sensu lato is constructed, and trait evolution of basidiocarps within Hymenochaetales is revealed accordingly.

Towards a Natural Classification of Hyphodontia Sensu Lato and the Trait Evolution of Basidiocarps within Hymenochaetales (Basidiomycota)