This is an amazing collection of information about North American medicinal mushrooms. It's 608 pages folks, a tomb of knowledge with good color photography.
From the back cover:
A valuable resource for mycolgists, mushroom hunters, and wild-crafters as well as consumers and practitioners of natural health care, The Fungal Pharmacy, is a landmark compendium in the field of natural medicine. Noted herbalist Robert Rorgers synthesizes a remarkable array of knowledge on over three hundred species of medicinal mushrooms and lichens found in North American, including: