New Contributions to the Species Diversity of the Genus (, ) in China: Four New Taxa and Newly Recorded Species.

, a well-defined genus in the family (order ), is characterized by its distinctive spine-bearing hymenophores. In this study, we performed a multi-locus phylogenetic analysis (ITS-nrLSU-) of species. Integrating morphological examinations and phylogenetic evidence, we identified and delineated five species in China, which include four novel species (, , , and ) and the first record () in Anhui Province. This study provides a comprehensive morphological description (including macroscopic morphology and microscopic structure), hand-drawn illustrations (encompassing basidiocarps, basidiospores, basidia, and pileipellis hyphae), morphological comparative analysis with similar species, and comparative phylogenetic analysis with related taxa. Furthermore, we developed a dichotomous key for identifying species distributed in China.