Phylogenetic and taxonomic updates of , with an emphasis on .

The order was divided into eight suborders. However, the phylogenetic relationships among some suborders are largely unresolved, and the phylogenetic positions and delimitations of some taxa, such as and , remain unsettled. In this study, sequence data of 38 genomes were generated through genome skimming on an Illumina sequencing system. To anchor the systematic position of and , a phylogenetic analysis based on 555 single-copy orthologous genes from the aforementioned genomes and 126 publicly accessible genomes was performed. The results fully supported the clustering of with and within Phyllotopsidaceae, which formed a divergent monophyletic major lineage together with , , and in . The analysis also revealed that formed a unique major clade. Therefore, two new suborders, and , are proposed for the two major lineages. Analyses of 450 single-copy orthologous genes and four loci suggested that consisted of at least four clades. is subsequently subdivided into four distinct sections. Seventeen species in China, including six new species, are reported. is established to accommodate . The substrate preference of species and the transitions of the pileate ornamentations among the species within the genus are discussed.