This really is the best book on psilocybin containing mushrooms I have ever seen. It not only contains listings of all the common species, but also many lesser known species too. For safety and accuracy of identification it also contains information about non-active and poisonous varieties. It gives very detailed information on the likely habitats of each species, and methods for taking spore prints, etc. If you want the best available field guide to psilocybin containing mushrooms – buy this book.