INTRODUCTION 21 



Paleobotany or Fossil Botany is the study of the remains 

 of plants that are found in rocks formed during past ages. 

 Cytology is the study of the minute structure of plant cells. 



THE PLANT GROUPS. 



Plants are classified in several great groups: 



1. Thallophytes which are divided into Algce and Fungi. 



2. Bryophytes which are divided into Liverworts and Mosses. 



3. Pteridophytes which are divided into Ferns, Horsetails 

 and Club Mosses. 



4. Gymnosperms. 



5. Angiosperms which are divided into Monocotyledons 

 and Dicotyledons. 



