A number of poisonous or inedible brown mushrooms that grow on wood are similar in appearance but do not match all the key characteristics. For example, the deadly Galerina marginata
is similar in color but differs in that the cap is smaller (up to 4 cm broad), the stem has a ring, and the gills are not free from the stem. A large number of closely related species of Pluteus
are similar in appearance. Of these, several species bruise blue and are psychoactive due to the presence of psilocybin.