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This book provides a comprehensive guide to the freshwater algae and desmidieae of the United States. It includes analytical keys to the genera and species, based on the classification system developed by Francis Wolle. With its detailed descriptions and illustrations, this book is an essential resource for anyone studying the ecology of freshwater systems. 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.