Beenak Long Tooth 
Berkeley's Polypore 
Bi-Colored Bracket 
Bicoloured Deceiver 
Big Sheath Mushroom 
Birch bolete 
Birch polypore 
Bitter Bolete 
Bitter Bracket 
Bitter false funnelcap 
Bitter Hedgehog 
Bitter iodine polypore 
Bitter oyster 
Bitter Tooth Fungus 
Black and white Clitocybula 
Black Tooth 
Black Trumpets 
Black velvet bolete 
Black Witch's Butter 
Black-footed Marasmus 
Black-footed polypore 
Black-staining Polypore 
Blackening russula 
Blackfoot polypore