CONTENTS 



Chapter I. Cycadofilicales . . . . 



1. Vegetative organs 



Vascular anatomy of Pteridophytes 

 Vascular anatomy of Cycadofilicales 

 Leaf .... 



2. Spore-producing members 



Microsporangium 

 Megasporangium 



3. Gametophytes 



Female gametophyte 

 Male gametophyte 



4. History and distribution 



5. Relationship to ferns 



Paleozoic ferns 



Origin of Cycadofilicales 



6. Relationship to other gymnosperms 

 Literature cited 



Chapter IL Bennettitales . 



1. Vegetative organs . 



Vascular anatomy 

 Leaf .... 



2. Spore-producing members 



Strobilus 



Microsporangium 



Megasporangium 



3. Gametophytes 



4. Embryo 



5. History and distribution 



6. Relationship to other gymnosperms 

 Literature cited 



I 



3 



4 



12 



21 



25 

 25 

 31 

 48 

 48 

 49 



51 



51 

 52 

 55 



58 



60 



65 

 66 

 70 



71 



72 



7- 



75 

 78 



82 



&3 

 85 

 86 



89 



Vll 



