322 Minnesota Algae 



Fig. 17. Microcystis marginata (Menegh.) Kuetz. (After West) 



Fig. 18. Microcystis fios-aquae (Witt.) Kirchn.' (After Eiijgler and Prantl) 



Fig. 19. Microcystis labens (Menegh.) Kuetz. (After Lemmermann) 



Fig. 20. Microcystis packardii (Farlow) Tilden. (Original) 



Fig. 21, 22. Clathrocystis aeruginosa (Kuetz.) Henfr. (After Engler and 



Prantl) 

 Fig. 23-28. Gomphosphaeria aponina Kuetz. (After West) 

 Fig. 29. Coelosphaerium kuetzingianum Naeg. (After West) 



Coelosphaeriopsis halophila Lemm. (After Lemmermann) 

 Tetrapedium trigonum W. and G. S. West. (After W. and G. 



S. West) . 

 Merismopedium aerugineum Breb. (After Kuetzing) 

 Merismopedium elegans A. Br. (After West) 

 Merismopedium novum Wood. (After Wood) 

 Merismopedium glaucum (Ehr.) Naeg. (After West) 

 Merismopedium convolutum Breb. (After Hansgirg) 

 Merismopedium tenuissimum Lemm. (After Lemmermann) 

 Fig. 38-40. Eucapsis alpina Clements and Shantz. (After Shantz) 

 Fig. 41. Oncobyrsa cesatiana Rab. (After Lemmermann) 

 Fig. 42. Chlorogloea tuberculosa (Hansg.) Wille. (After Wille) 



PLATE IIL 

 Fig. I. Pleurocapsa caldaria (Tilden) Setchell. (Original) 

 Fig. 2, 3. Pleurocapsa fuliginosa Hauck. (After Hauck) 

 Fig. 4. Pleurocapsa amethystea Kolderup-Rosenvinge. (After Kolder- 



up-Rosenvinge) 

 Fig. S, 6. Xenococcus laysanensis Lemm. (After Lemmermann) 

 Fig. 7. Xenococcus schousboei Thur. (After Engler and Prantl) 

 Fig. 8. Xenococcus kerneri H&nsg. (After Hansgirg) 

 Fig. 9-11. Hyella caespitosa Born, and Flah. (After Engler and Prantl) 

 Fig. 12. Hyella fontana Buber and Jadin. (After Lemmermann) 

 Fig. 13-15. Dermocarpa prasina (Reinsch) Born, and Thur. (After Bor- 



net and Thuret) 

 Fig. 16-18. Dermocarpa (?) rosea (Reinsch) Batters. (After Reinsch) 

 Fig. 19-21. Dermocarpa violacea Crouan. (After Crouan) 

 Fig. 22, 23. Dermocarpa fucicola Saunders. (After Saunders) 

 Fig. 24, 25. Dermocarpa smaragdina (Reinsch) Tilden. (After Reinsch) 

 Fig. 26, 27. Dermocarpa olivacea (Reinsch) Tilden. (After Reinsch) 

 Fig. 28. Dermocarpa leibleiniae (Reinsch) Born. var. pelagica Wille 



(After Wille) 

 Fig. 29-30. Chamaesiphon incrustans Grun. (After West) 

 Fig. 31. Chamaesiphon curvatus Nordst. (After Nordstedt) 



Fig. I 



PLATE IV, 

 Oscillatoria prolifica (Grev.) Gom. (After Gomont) 



Fig. 2. Oscillatoria agardhii Gom. (After Lemmermann) 



Fig. 3. Oscillatoria princeps Vauch. (After Gomont) 



Fig. 4. Oscillatoria proboscidea Gom. (After Gomont) 



Fig. S. Oscillatoria sancta Kuetz. (After Gomont) 



Fig. 6. Oscillatoria limosa Ag. (After Gomont) 



Fig. 7. Oscillatoria curviceps Ag. (After Gomont) 



Fig. 8. Oscillatoria ornata Kuetz. (After Gomont) 



Fig. 9. Oscillatoria anguina Bory. (After Gomont) 



Fig. 10. Oscillatoria bonnemaisonii Crouan. (After Gomont) 



Fig. II. Oscillatoria margaritifera Kuetz. (After Gomont) 



Fig. 12. Oscillatoria nigro-viridis Thwaites. (After Gomont) 



Fig. 13-15. Oscillatoria capitata W. West Jun. (After West) 



Fig. 16. Oscillatoria corallinae Gom. (After Gomont) 



Fig. 17-18. Oscillatoria tenuis Ag. (After Gomont) 



Fig. 19, 20. Oscillatoria amphibia Ag. (After Gomont) 



Fig. 21. Oscillatoria minnesotensis Tilden. (Original) 



Fig. 22. Oscillatoria chlorina Kuetz. (After Wood) 



