TABLE OF CONTENTS 



Introduction 1 



Geographical Features and Algal Distribution 4 



Soil types and algal distribution: Michigan; Wisconsin — Lake types 

 and algal distribution: hard water drainage; hard water seepage; 

 soft water drainage; soft water seepage; acid bog; alkaline bog — 

 Summary 



Relationships of Phytoplankton to Lake Productivity 34 



Chlorophyll as an index of production — Physical-chemical factors: 

 carbon dioxide; oxygen; hght; nitrogen and phosphorus; bottom 

 deposits — Quality of algal floras — Water blooms — The food chain 

 — Factors uiat determine the character of lake floras. 



Morphological Characters Illustrated 51 



Systematic Account 65 



Division Chlorophyta 65 



Class Chlorophyceae: Orders Volvocales; Tetrasporales; Ulotrichales; 



Microsporales; Cylindrocapsales; Sphaeropleales; Chaetophorales; 



Cladophorales; Oedogoniales; Chlorococcales; Siphonales; Zygne- 



matales — Class Charophyceae: Order Charales. 



Division Chrysophyta 342 



Class Xanthophyceae: Orders Heterochloridales; Rhizochloridales; 

 Heterocapsales; Heterocococcales; Heterotrichales; Heterosipho- 

 nales — Class Chrysophyceae: Orders Chrysomonadales; Flhizo- 

 chrysidales; Chrysocapsales; Chrysosphaerales; Chrysotrichales. 



Division Euglenophyta 387 



Class Euglenophyceae: Order Euglenales. 



Division Chloromonadophyta 421 



Division Pyrrhophyta 423 



Class Dinophyceae: Orders Gymnodiniales; Peridiniales; Dinococ- 

 cales — Class Cryptophyceae. 



Division Cyanophyta 443 



Class Myxophyceae: Orders Chroococcales; Chamaesiphonales; Hor- 

 mogonales— CZass Chlorobacteriaceae. 



Division Rhodophyta 562 



Class Rhodophyceae: Orders Bangiales; Nemalionales. 



Analytical Key to the Genera 571 



Glossary 596 



Bibliography 610 



Plates 661 



Appendix: Desmid and Diatom Genera 934 



Appendix Index 964 



Index 965 



XIU 



