The only English-language identification guide book to all the psilocybin-containing mushrooms of the world, this book is a must have for those interested in the so called "magic mushrooms." Psilocybin Mushrooms of the World, by Stamets and Weil, contains detailed descriptions and color photos of more than 100 psilocybin-containing mushroom species. It also tells tells the story of the spiritual use of mushrooms by ancient cultures all the way to their modern-day significance.