The fruitbodies and cultures of A. areolatum and A. chailletii may be recognized by using hymenial colours, basidiospore size, colour of mycelial mat on PDA, and presence or absence of oidia in culture. Basidiospore size is just as useful a characteristic for separating fruitbodies of A. areolatum and A. chailletii as presence or absence of oidia is for cultures. Conflicting information from previous literature is discussed.