Illustrated Genera of Imperfect Fungi, Fourth Edition is an update of the classic reference that mycologists and others interested in imperfect fungi have relied upon for decades. It provides comprehensive information for recognizing, identifying, and learning various aspects of the reproductive and somatic morphologies of imperfect fungi. Its practical use in the identification of imperfect fungi makes it an essential tool.Changes in the 4th Edition include: The inclusion of general introduction to the imperfect fungi. It provides basic information about the use of the Saccardoan System as the basis for identifying imperfect fungi and studying their nature and diversity. The deletion of 52 genera that are infrequently isolated and have little economic impact. The addition of a simplified key of selected common genera-- a valuable reference tool. It includes fungi generally found in air, soil, and decaying vegetation. It can also be used to verify identifications made from the extended keys in the book. Updated and modified keys to make them more useful and error-free. Publication of scanning electron micrographs illustrating each method of conidial formation in the Hughes-Tubaki-Barron System. An expanded reference section that includes literature related to the new narrative section.