Agaricomycetes (Mushrooms, Bracket Fungi, Puffballs, And Allies) is a class of Fungi. There are 36410 species of Mushrooms, Bracket Fungi, Puffballs, And Allies, in 1606 genera and 112 families.
Definition: A group of species that exploit the same food resources, and/or use the same feeding or foraging methods. http://en.wikipedia.org/wiki/Guild_(ecology)