OUR ;.',;::,. 



NATIVE FERNS 



AND 



THEIR ALLIES 



WITH 



Synoptical Descriptions of tbe American 

 Pteridopbyta North of Mexico 



LUCIEN MARCUS UNDERWOOD 



Professor of Botany in De Pau-w University 



FOURTH EDITION, REVISED 



NEW YORK 

 HENRY HOLT AND COMPANY 



1893 



