officinalis, Fomitopsis

ohiensis, Laccaria

olearius, Omphalotus

olivaceoalbus, Hygrophorus

omphalodes, Lentinellus

onusta, Amanita

oreades, Marasmius

ostoyae, Armillaria

ostreatus, Pleurotus

ovina, Hygrocybe

ovinus, Albatrellus

pachysperma, Amanita