Guepinia 
Gumtree Deceiver 
Gunpowder Amanita 
Gymnopilus allantopus 
Gymnopilus bellulus 
Gymnopilus delepis 
Gymnopilus ferruginosus 
Gymnopilus subspectabilis 
Gymnopus confluens 
Gymnopus earleae 
Gymnopus fuscopurpureus 
Gymnopus perforans 
Gymnopus subnudus 
Gymnopus subpruinosus 
Gymnopus subsulphureus 
Gymnopus villosipes 
Gypsy mushroom 
Gyroporus borealis 
Gyroporus purpurinus 
Hairy bracket 
Hairy Curtain Crust 
Hairy Hexagonia 
Hairy Leg Bell 
Hairy Long Stem Marasmius