 Many members of the Entolomataceae are poisonous and most are very obscure and difficult to identify properly.Examples are the poisonous type species of "Entoloma", "Entoloma sinuatum", found in Europe and North America, and "E. rhodopolium" in Europe and Japan.The family Entolomataceae was first defined by the Czech mycologists František Kotlaba and Zdenek Pouzar in 1972.