This book introduces you to the fungi kingdom, from familiar mushrooms to unicellular yeasts. It examines the types of fungi, their reproductive methods, and how they feed. It also looks at modern uses of fungi, as well as how fungi recycle dead organic matter into useful nutrients. Did You Know? There are about 100,000 species of fungi. Some fungi digest their food outside of their bodies. Not counting tree roots, 90 percent of all living matter in forest soil is made up of fungi.