CONTENTS. 



CHAPTER I.— PRINCIPAL GROUPS OF PLANTS. 



PAGE 



Introductory , i 



Thallophytes 6 



Schizophy tes 7 



Schizophyceae (Fission Algae) 8 



Schizomycetes (Bacteria) 12 



Algae 16 



Chlorophyceas (Green Algae) 20 



Phasophyceae (Brown Algae) 28 



Rhodophycese (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 



Bryophytes 76 



Hepaticae (Liverworts) 80 



Musci (Mosses) 84 



Pteridophy tes 86 



Filicales (Ferns) 87 



Equisetales (Horsetails) " 96 



Lycopodiales (Club Mosses) 97 



Spermophytes (Seed Plants) 100 



Gymnosperms ' loi 



Angiosperms = 1 19 



Organic Evolution 128 



CHAPTER IL— CELL-CONTENTS AND FORMS OF CELLS. 



Protoplasmic Cell-Contents i34 



Non-Protoplasmic Cell-Contents 140 



Factors Influencing Growth, Including Food of Plants 246 



Forms of Cells 262 



Parenchyma ^^^ 



Mechanical Tissue 264 



Conducting or Mestome Cells 272 



Protecting Cells '^^^ 



vii 



