CONTENTS 



CHAPTER PAGE 



I. INTRODUCTION . . 1 



II. THALLOPHYTES : AL.GJE 4 



III. THE EVOLUTION OF SEX 12 



IV. THE GREAT GROUPS OF ALG^E ... . . 17 



V. THALLOPHYTES: FUNGI 48 



VI. THE FOOD OF PLANTS 83 



VII. BRYOPHYTES . . .93 



VIII. THE GREAT GROUPS OF BRYOPHYTES 109 



IX. PTERIDOPHYTES 128 



X. THE GREAT GROUPS OF PTERIDOPHYTES .... 155 



XI. SPERMATOPHYTES : GYMNOSPERMS 171 



XII. SPERMATOPHYTES : ANGIOSPERMS 195 



XIIL THE FLOWER 218 



XIV. MONOCOTYLEDONS AND DICOTYLEDONS 232 



XV. DIFFERENTIATION OF TISSUES 280 



XVI. PLANT PHYSIOLOGY 297 



XVII. PLANT ECOLOGY . . . 311 



GLOSSARY . 329 



INDEX ' . 337 



ix 



