PTERIDOPHYTA 157 
Angiosperme 
Heterosporese 
Cycadaceze 
Leptosporangiate 
Isosporez 
Heterosporeze Conifer (?) 
Heterosporee Heterosporeze 
Isosporese 
Isosporese Tsosporez 
Eusporangiate 
Horsetails Ferns Club-mosses 
(Equisetinex) (Filicinee) (Lycopodinez) 
Liverworts 
(Hepaticz) 
Diagram to illustrate the relationships between the three existing 
classes of Pteridophytes and the Spermatophytes. 
