Douglas Houghton Campbell was a botanist and educator renowned for his work on the structure and development of mosses and ferns. In this classic text, Campbell blends scientific rigor with a deep appreciation for these fascinating plants, presenting a comprehensive survey of their morphology and reproduction. This book is an essential reference for botanists, plant scientists, and anyone interested in the rich diversity of plant life on earth. 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.