xxii LIST OF ILLUSTRATIONS 



PAGE 



84. Ferns, various genera, reproduction and development . . .352 



85. Equisetum^ reproduction and development ...... 363 



86. Salvinia, reproduction and development ....... 365 



87. Selaginella, reproduction and development . . . . . . 368 



88. GymnospermS) reproduction and development ..... 370 



89. Angiosperms, reproduction and development ...... 375 



