This represents 25 years of work and close collaboration between the authors and gives a detailed taxonomic treatment of and identification guide to the mosses of the Eastern Deciduous Forest of North America. To extend the usefulness of the work some species likely to be found in peninsular Florida, The Central Prairies, and the Hudson Bay Lowlands are also included. Because of considerable topographic and vegetational diversity within the Eastern Deciduous Forest the book is also nearly complete for the entire Boreal Forest and the Rocky Mountains. With over 600 line drawings this work is an invaluable guide for any bryologist.