

ALGAE 



OF THE 



^ESlim GREAT LAKES AREA 



With an Illustrated Key to the Genera of Desmids and Freshwater Diatoms 



G. W. PRESCOTT, Ph.D. 



Department of Botany and Plant Pathology 

 Michigan State University 

 East Lansing, Michigan 



Revised Edition 



WM. 



C. BROWN COMPANY PUBLISHERS 



!\ 



Dubuque, Iowa 



