THE FERNS 



(FILICALES) 



TREATED COMPARATIVELY WITH A VIEW TO THEIR 

 NATURAL CLASSIFICATION 



VOLUME III 

 THE LEPTOSPORANGIATE FERNS 



BY 

 F. O. BOWER, Sc.D., LL.D., F.R.S. 



EMERITUS PROFESSOR OF BOTANY 

 IN THE UNIVERSITY OF GLASGOW 



CAMBRIDGE 



AT THE UNIVERSITY PRESS 



1928 



