officinalis, Fomitopsis
ohiensis, Laccaria
olearius, Omphalotus
olivaceoalbus, Hygrophorus
omphalodes, Lentinellus
onusta, Amanita
oreades, Marasmius
ostoyae, Armillaria
ostreatus, Pleurotus
ovina, Hygrocybe
ovinus, Albatrellus
pachysperma, Amanita