This book provides a comprehensive guide to identifying and studying common mosses found in the northeastern United States, featuring detailed descriptions, illustrations, and photographs. It offers an accessible and non-technical approach, making it suitable for both amateurs and professionals in the field. The book's author, Abel Joel Grout, was a noted botanist and moss specialist, making it a reliable and authoritative source of information. This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work is in the "public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.