Taxonomy and phylogeny of (, ): two new genera, nine new species and twenty new combinations.

An in-depth study of the taxonomy and phylogeny of the was conducted. Specimens collected from East Asia were studied by using morphological and molecular systematic methods. The phylogenetic analyses were based on a concatenated ITS1-5.8S-ITS2 (ITS) and the D1-D2 domains of nuc 28S rDNA (LSU) sequence data of by using the maximum parsimony, maximum likelihood and Bayesian inference methods. Fourteen lineages including two new genera, and , are recognized in the phylogenetic tree. , typified by , is segregated from s. lat. is sister to in the tree but differs in having gelatinous basidiomes and lacking thick-walled pseudocystidia. is shown to be restricted to include species with smooth basidiospores, while species with ornamented basidiospores are nested within the lineage. The delimitation of is expanded based on the phylogenetic analyses. It includes species with or without clamp connections and acanthohyphidia and with a large variety of basidium size. is treated as a later synonym of sensu stricto, since their type species and were nested within the same lineage. With this disposal, s. str. now includes species with smooth or ornamented basidiospores. The generic name, is applied for the lineage of species of s. lat. with resupinate basidiomes, well-developed acanthohyphidia and smooth basidiospores, while is regarded as a synonym of . Nine new species, , , , , , , , and are described and illustrated from China. Twenty new combinations, , , , , , , , , , , , , , , , , , , and are proposed. is treated as a synonym of . Morphological differences between closely related genera are discussed, and an identification key to all 14 genera of is presented. Xu YL, Cao YF, Liu SL, Nakasone KK, He SH (2025). Taxonomy and phylogeny of (, ): two new genera, nine new species and twenty new combinations. : 119-145. doi: 10.3114/persoonia.2025.54.04.