CONTENTS xv 



CHAPTER VI 



LYCOPODIALES — continued 



Ulodendron and Halonia; Fructifications of Lepidodendreae ; 

 Bothrodendron 



PACE 



1. Ulodendron and Halonia . 165 



2. Lepidostrobus 173 



3. Spencerites 189 



4. The Seed-like Lycopodiaceous Fructifications 193 



5. Bothrodendron 199 



CHAPTER VII 



lycopodiales — continued 



Sigillaria and Stigmaria; Lycopoditeae 



I. Sigillaria 204 



1. Habit and External Characters . 204 



2. Anatomical Structure 214 



3. Fructifications . 231 



II. Stigmaria 237 



1. Habit and External Characters 237 



2. Anatomical Structure 242 



3. Morphology 259 



III. Lycopoditeae 262 



Conclusion . 265 



CHAPTER VIII 



THE FERNS 



Fronds ; Fructifications ; Anatomy 



Introductory Remarks . . 267 



1. Fronds . 269 



2. Fructifications 274 



3. Anatomy — Psaronius 294 



