Four species of , , , and are described as new and is proposed as a new combination, based on morphological characteristics and molecular phylogenetic analyses inferred from internal transcribed spacer (ITS) and large subunit nuclear ribosomal RNA gene (nLSU) sequences. , and occur in China, occurs in the USA, and the distribution of is extended from New Zealand to Australia. is characterized by the distinct narrow oblong basidiospores measuring 10. 5-13.5 × 3.9-5 µm. is characterized by the presence of ventricose cystidioles occasionally with a simple septum, dissepimental hyphae usually with a simple septum, unique thick-walled basidia and distinctly wide oblong basidiospores measuring 13.5-16.5 × 7.5-9.5 µm. is characterized by its large pores (2-3 per mm), a dimitic hyphal structure with non-dextrinoid skeletal hyphae and wide oblong basidiospores measuring 12-15 × 6-8 µm. is characterized by distinctly small pores (7-9 per mm), the presence of dendrohyphidia, and distinctly small ellipsoid basidiospores measuring 5.3-6.7 × 3-4.1 µm. is proposed as a new combination. is shown to be a synonym of and is considered a synonym of .