'Edible and Medicinal Mushrooms of New England and Eastern Canada' David Spahr
This is a gem of a field guide if you're located in New England. It's a great book for beginner foragers who want to learn some easy to identify edible and medicinal mushrooms. Colorful, full of pictures, and geared towards novices. David Spahr is a mycologist based in Maine. It also has sections on dyeing with mushrooms and mushroom preparation.
His website is also a great resource for mushroom hunters in New England.