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<i>Poriella</i> <i>subacida</i> gen. & comb. nov., previously known as <i>Perenniporia subacida</i>, which causes white rot, has been documented in temperate and tropical forests. Specimens from Asia, North America, and Europe were examined, including the type specimen of <i>Polylorus subacidus</i>. Sequences of the ITS1-5.8S-ITS2 region, the 28S rDNA, the mitochondrial rDNA small subunit (mtSSU), and the gene encoding the translation elongation factor 1-α (EF1) were generated. In multigene phylogenies (maximum parsimony, maximum likelihood, Bayesian inferences), “<i>Perenniporia subacida</i>” formed a well-supported lineage, distinct from the core “<i>Perenniporia</i>” clade (type species: “<i>P</i>. <i>medulla</i>-<i>panis</i>”), and sister to the “<i>Yuchengia narymica</i>” lineage. We therefore conclude that “<i>P</i>. <i>subacida</i>” should be placed in the new genus “<i>Poriella</i>”gen. nov. Morphologically, “<i>Poriella</i>” is characterized by a di- to trimitic hyphal system, non-truncate basidiospores, and strongly dextrinoid, cyanophilic skeletal hyphae.