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Part One Life Cycle of a Fern 3 The Place of Ferns and Fern Relatives in the Plant Kingdom 9 Fern Habitats and Conservation 16 Morphology of a Fern 21 How to Use This Field Guide 29 Key to the Genera of Northeastern and Central North American Ferns and Related Species 32 Part Two: True Ferns Genus Adiantum (Maidenhair Ferns) 54 Genus Asplenium (Spleenworts) 59 Genus Athyrium (Lady Ferns) 85 Genus Azolla (Mosquito Fern) 89 Genus Cheilanthes (Lip Ferns) 92 Genus Cryptogramma (Parsley Ferns or Rock Brakes) 99 Genus Cystopteris (Bladder Ferns) . 103 Genus Dennstaedtia (Hay-scented Fern) 115 Genus Deparia (Silvery Glade Fern) 1 18 Genus Diplazium (Glade Fern) 122 Genus Dryopteris (Wood Ferns) 1 26 Genus Gymnocarpium (Oak Ferns) 150o Genus Lygodium (Climbing Ferns) 155 Genus Marsilea (Water Shamrock) I 58 Genus Matteuccia (Ostrich Fern) 162 Genus Onoclea (Sensitive Fern) 166 Genus Osmunda (Flowering Ferns) 170 Genus Pellaea (Cliffbrakes) I 78 Genus Phegopteris (Beech Ferns) 184 Genus Pleopeltis (Shield-sorus Ferns) 190 Genus Polypodium (Polypodies) 1 92 Genus Polystichum (Holly Ferns) '97 Genus Pteridium (Bracken or Brake) 203 Genus Schizaea (Curly Grass Fern) 206 Genus Thelypteris (Marsh Ferns) 208 Genus Trichomanes (Filmy Ferns) 2 6 Genus Vittaria (Shoestring Fern) 221 Genus Woodsia (Cliff Ferns) 224 Genus Woodwardia (Chain Ferns) 235 Genera Botrychium and Ophioglossum (Succulent Ferns) 240 Genus Botrychium subgenus Osmundopteris 247 Genus Botrychium subgenus Botrychium 250 Genus Botrychium subgenus Sceptridium 265 Genus Ophioglossum (Adder's-tongues) 271 Part Three: Fern Relatives Genera Dendrolycopodium, Diphasiastrum, Huperzia, Lycopodiella, Lycopodium, Pseudolycopodiella, Spinulum (Clubmosses and Firmosses) 280 Genus Dendrolycopodium (Tree Clubmosses) 285 Genus Diphasiastrum (Ground Cedars) 292 Genus Huperzia (Firmosses) 303 Genus Lycopodiella (Bog Clubmosses) 313 Genus Lycopodium (Clubmosses) 320 Genus Pseudolycopodiella (Slender Bog Clubmoss) 326 Genus Spinulum (Bristly Clubmosses) 328 Genus Equisetum (Horsetails and Scouring Rushes) 333 Genus Isoetes (Quillworts) 360 Genus Selaginella (Spikemosses) 371 Part Four Ferns in Cultivation and Culture 384 Glossary 391 Bibliography 398 Useful Web Sites 403 Photograph and Illustration Credits 404 Index 405