Provides detailed information on nearly 600 species and varieties of boletes, fleshy, readily decaying pore fungi of the family Boletaceae. Included are brief descriptions, comments on habitat and distribution, literature references, synonyms, a bibliography of more than 300 titles, etymologies of epithets, and an index with over 1300 entries. It is the only work that treats all boletes described and reported from North America, exclusive Of Mexico.