The Fungi: An Advanced Treatise, Volume III: The Fungal Population attempts to relate fungi to their environment as symbionts, saprobes, and parasites. This book discusses the effects of the interaction of fungi with their environment, and the summation of these effects as reflected in the geographical distribution and number of fungi is described. Organized into eight parts encompassing 27 chapters, this volume begins with an overview of the ecology of fungi. This text then examines the taxonomy, morphology, and physiology of freshwater fungi. Other chapters consider the ecology of marine, saprobic fungi that falls into three categories, namely, ecological distribution, geographical distribution, and occurrence and habitat. This book discusses as well the characteristics and temperature ranges for growth of each of the known species of thermophilic fungi. The final chapter deals with the importance of the major characteristics of fungi. This book is a valuable resource for mycologists, botanists, paleobotanists, and taxonomists.