XV 



SUMMARY AND CONCLUSIONS 



519 



through Isoetes, and the Eusporangiatae would bear somewhat 

 the same relation to the Angiosperms and Leptosporangiata; 

 that the Anthocerotea; do to the Musci on the one hand, and 

 the Pteridophytes on the other. 



To summarise briefly : the conclusion reached is that the 

 Spermaphytes represent not one single line of development, 

 but at least two, and perhaps more, entirely independent ones, 

 having their origin from widely separated stocks. The Gymno- 

 sperms (at least the Conifers) are probably direct descendants 

 of some group of Lycopods allied to the Selaginelleae, while 

 the origin of the Angiosperms is to be looked for among the 

 eusporangiate Filicinere. 



AngiosperjticE 



Gy7nnosperjna; 



MarsiliacecE 



SpJi agnSxT-Hi: ^ 



Salviniaccff 



HcpaticcP. 



