fam. nov. (, ) for gen. et sp. nov. and Three New Combinations.

, belonging to , , comprises most polypores and corticioid fungi and, also, a few agarics. The latest taxonomic framework accepts 14 families in this order. When further exploring species diversity of , two corticioid specimens collected from China producing cystidia with large umbrella-shaped crystalline heads attracted our attention. This kind of cystidia was reported only in three unsequenced species, viz. , and , which were accepted in , . The current multilocus-based phylogeny supports that the two Chinese specimens formed an independent lineage from as well as the additional 13 families and all sampled genera in . Therefore, a monotypic family, is newly described with the new genus as the type genus to represent this lineage. The two Chinese specimens are newly described as , which differs from , and in a combination of a smooth to grandinioid hymenophoral surface, not flattened, broadly ellipsoid basidiospores with a tiny apiculus, and growth on angiosperm wood. Due to the presence of the unique cystidia, the three species of , even though they lack available molecular sequences, are transferred to as , and . Hereafter, all known species with large umbrella-shaped crystalline-headed cystidia are in a single genus. In summary, the current study provides a supplement to the latest taxonomic framework of and will help to further explore species diversity and the evolution of this fungal order.