From the author of "Growing Gourmet and Medicinal Mushrooms" comes the only identification guide dedicated solely to the psilocybin-containing mushrooms of the world. Detailed descriptions and color photographs of over 100 species are provided, along with an exploration of their long-standing (and often religious) use by ancient peoples and their ongoing significance in modern culture. Some of the species included have only been discovered in the last one or two years, and others have never been photographed in their natural habitat before.