PTERIDOPHYTA 



Angiosperuise 



Heterosporese 



Leptosporangiatse 

 Isosporese 



Heterosporese 



Cycadacese 



Heterosporese 



Isosporepe 



Isosporese 



Coniferse (?) 



Heterosporese 



Isosporese 



Eusporangiatae 



Horsetails Ferns Club-mosses 



(Equisetinese) (Filicinese) (Lycopodinese) 



Liverworts 

 (Hepaticae) 



Diagram to illustrate the relationships between the three existing 

 classes of Pteridophytes and the Spermatophytes. 



