Beefsteak Polypore 
Beenak Long Tooth 
Bell morel 
Berkeley's Polypore 
Bi-Colored Bracket 
Biatora flavopunctata 
Biatora printzenii 
Bicoloured Deceiver 
Big Sheath Mushroom 
Bighorn Lichen 
Bilimbia sabuletorum 
Birch bolete 
Birch polypore 
Birch Witch's-Broom 
Birch Woodwart 
Bitter Bolete 
Bitter Bracket 
Bitter false funnelcap 
Bitter Hedgehog 
Bitter iodine polypore 
Bitter oyster 
Bitter Tooth Fungus 
Black and white Clitocybula 
Black Bread Mold