The taxonomy of the genus Fusarium has been the subject of controversy for many years. Die Fusarien, published in 1935 by Wollenweber and Reinking, has been used as a starting point in this book. Since 1935 several other taxonomic systems have been proposed for this genus. These systems vary from one with over 90 species to one with only nine species; several other systems fall between these two extremes. All of these systems are based on the work of Wollenweber, and although each system has something to offer, none of them is satisfactory by itself for the identification of all Fusarium species. In this volume we have selected the best features of several systems and combined them in a compromise system that will allow the individual worker to identify Fusarium species using several of the current taxonomic systems. The identification of species is facilitated by synoptic keys for the sections and species. These keys offer the user the choice of many characters in identifying the culture, and the keys may be entered at any point.