Freshwater fungi are diverse in numbers, taxonomic groups and ecological roles, but they have been a relatively neglected group until the last decade. This book brings together information on freshwater fungi, reviewing topics and providing informative comprehensive text on practical approaches for their study. The book presents chapters authored by leading experts on topics including; isolation and identification, plant and animal pathogens, teleomorph-anamorph connections, ecology, microscope techniques, measuring fungal activity, effects of pollution, interactions with stream invertebrates, and dispersal. This book will serve as a catalyst for further development of our understanding of freshwater mycology in the 21st Century.