Badahmiopsis, Badhamia, Baeospora, Balsamia, Bankera, Barbeyella, Barya, Basidiodendron, Batarrina, Battarraea, Belonioscypha, Belonium, Belonopsis, Berlesiella, Bertia, Betulina, Biatorella, Bifusella, Bisporella, Bjerkandera, Boidinia, Bolbitius, Boletinus, Boletopsis, Boletus, Bolinia, Bombardia, Bombardioidea, Bondarzewia, Boreostereum, Botryobasidium, Botryohypochnus, Botryosphaeria, Boudiera, Bourdotia, Bovista, Bovistella, Brefeldia, Brevicellicium, Broomella, Buchwaldoboletus, Buergenerula, Buglossoporus, Bulbillomyces, Bulgaria, Bulgariella, Butlerelfia, Bysscocorticium, Byssolophis