This book is aimed at anyone who is interested in trees or fungi. Trees cannot exist in the natural environment without fungi, and their interactions are the underlying theme running throughout this book. This includes the mutualistic partnerships formed between fungi and the roots of trees, endophytic fungi living inconspicuously within all tree tissues, the fungi that harm trees, and the fungi that break down dead tree tissues, recycling the nutrients within them and making them available for further tree growth. Our environment is changing rapidly. The ways in which this affects trees and their associated fungi are considered, along with management and needs for conservation of species and habitat. The book is copiously illustrated with photographs, diagrams and tabulated summaries.