CONTENTS. 



CHAPTER I. PRINCIPAL GROUPS OF PLANTS. 



PAGE 



INTRODUCTORY i 



THALLOPHYTES 6 



Schizophytes 7 



Schizophyceas (Fission Algae) 8 



Schizomycetes (Bacteria) 12 



Algae 16 



Chlorophyceae (Green Algae) 20 



Phaeophyceae (Brown Algae) 28 



Rhodophyceae (Red Algae) 31 



Diatoms 35 



Fungi .' 40 



Phycomycetes (Alga-like Fungi) "... 42 



Ascomycetes (Including Yeasts) 47 



Basidiomycetes 56 



Fungi Imperfecti 70 



Lichens 71 



ARCHEGONIATES 75 



Bryophy tes 76 



Hepaticae (Liverworts) 80 



Musci (Mosses) 84 



Pteridophytes 86 



Filicales (Ferns) . 87 



Equisetales (Horsetails) 96 



Lycopodiales (Club Mosses) 97 



SPERMOPHYTES (SEED PLANTS) .' 100 



Gymnosperms 101 



Angiosperms 119 



ORGANIC EVOLUTION 128 



CHAPTER II. CELL-CONTENTS AND FORMS OF CELLS. 



PROTOPLASMIC CELL-CONTENTS 134 



NON-PROTOPLASMIC CELL-CONTENTS 140 



FACTORS INFLUENCING GROWTH, INCLUDING FOOD OF PLANTS 246 



FORMS OF CELLS 262 



Parenchyma 262 



Mechanical Tissue 264 



Conducting or Mestome Cells 272 



Protecting Cells 277 



vii 



