Steven Trudell, PhD, and Joe Ammirati, PhD, know their ’shrooms.

Authors of the recently released Mushrooms of the Pacific Northwest, Trudell is an affiliate professor of forest resources and lecturer in biology, while Ammirati is a professor of biology who specializes in mycology (the study of mushrooms). Both teach at the University of Washington.

The profs wrote this book because mushroom guides are plentiful, but they could never find one that focused on the Pacific Northwest—an area with diverse and abundant mushrooms. In 352 pages, with more than 460 photos, they cover the geographical area, fungi basics, mushroom collecting, fungus ecology and mushroom poisoning.

Mushrooms of the Pacific Northwest makes a great gift for organic mushroom aficionados. It regularly retails for $27.95, but Amazon is currently offering the book for $18.45 (a 34% savings).