Ganoderma adspersum – synonym of Ganoderma australe
Ganoderma applanatum – synonym of Ganoderma lipsiense
Geastrum nanum – synonym of Geastrum schmidelii
Geastrum sessile – synonym of Geastrum fimbriatum
Geastrum vulgatum – synonym of Geastrum rufescens
Geoglossum nigritum – synonym of Geoglossum umbratile
Geopetalum carbonarium – synonym of Faerberia carbonarium
Gerronema daamsii – synonym of Omphalina marchantiae
Gerronema postii – synonym of Omphalina postii
Gloeocystidiellum leucoxanthum – synonym of Megalocystidium leucoxanthum
Grifola umbellata – synonym of Polyporus umbellatus
Gymnopilus penetrans – synonym of Gymnopilus sapineus
Gymnopilus spectabilis – synonym of Gymnopilus junonius