CONTENTS XV 



CHAPTER XVI 



Page 



The Pteridophyta 325 



The advance from bryophytes to pteridophytes — Filicineae or ferns 

 Lycopodineae or club mosses — Equisetineae or horsetails. 



CHAPTER XVII 



The Spermatophyta 344 



The origin of the seed — The advances from pteridophytes to seed 

 plants — The flower — Gymnospermae or gymnosperms — Angio- 

 spermae or angiosperms — Dicotyledoneae or dicotyledons — 

 Monocotyledoneae or monocotyledons. 



Index 371 



