North American Mushrooms: A Field Guide to Edible and Inedible Fungi (Falconguide)

by Orson K. Miller Jr.

Amanitaceae and Gomphidiaceae are all ectomycorrhizal with tree species. It would not be possible to find an Amanita or a Gomphidius, for example, fruiting in a grasslands, devoid of the tree hosts.