OUR 



NATIVE FERNS 



AND 



THEIR ALLIES 



WITH 



Synoptical Descriptions of the American 

 Pteridopbyta North of Mexico 



LUCIEN M. UNDERWOOD, PH.D. 



Professor of Biology in Syracuse University 



THIRD EDITION, REVISED 



NEW YORK 

 HENRY HOLT AND COMPANY 



1888 



