The Fern Allies of North America North of Mexico

xiv, 278 pp. With more than one hundred and fifty illustrations by Ida Martin Clute. Color frontispiece. CONTENTS: List of Illustrations; Preface; The Fern Allies; Key to the Families of Fern Allies; The Equisetaceae: Scouring-Rushes and Horsetails; Key to the Species of Equisetum; The Evergreen Equisetums, or Scouring-Rushes; The Deciduous Equisetums, or Horsetails; The Lycopodiaceae, or Club-Mosses; Key to the Lycopodiums; The Trailing Lycopodiums; The Erect or Decumbent Lycopodiums; The Psilotaceae; The Selaginellaceae, or Dwarf Club-Mosses; Key to the Selaginellas; The True Selaginellas, or Selaginella Rupestris Group; The Creeping Selaginella Group; The Salviniceae; Salvinia; The Azollas; The Marsilliaceae, or Pepperworts; Key to the Marsilias; The Marsilias; The Isoetaceae, or Quillworts; Key to the Isoetes; The Aquatic Quillworts; The Amphibious Quillworts; The Terrestrial Quillworts; Checklist of the Fern Allies; Glossary; Index to the Common Names; Index to the Scientific Names.