CONTENTS 



Chapter I. Gycadohlicales 

 I. Vegetative organs 



Vascular anatomy of Pteridophytes 

 Vascular anatoiny of Cycadofilicales 

 Leaf . . ... 



2. Spore-producing members 



Microsporangium 

 Megasporangiiun 



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 II. 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 

 yterature cited .... 



PAGE 

 I 



3 



4 



12 



21 



25 



25 

 31 

 48 

 48 

 49 

 SI 



SI 

 S2 

 SS 



S8 

 60 



6S 

 66 



70 

 71 



72 

 72 



75 

 78 



82 

 83 

 85 

 86 

 89 



