224 BOTANICAL GAZETTE [September 



the relations of Lygodium so ancient, that we can hardly consider it to 

 be very close to the evolutionary line that leads to the Polypodiaceae. 

 It seems rather to have appeared very early in the evolution of lepto- 

 sporangiate ferns and to have progressed in a line somewhat divergent 

 from the main line leading to the polypods. 



This work was done under the supenision of Professors John M 

 Coulter and Charles J. Chamberlain. 



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GuTLFORD College, N. C. 





