1923] 



MOORE 



NORTH DAKOTA LAKES 413 



Family Tetrasporaceae 

 Genus botryococcus Kutz. 



Botryococcus Braunii Kiitz. 



Main Wheeler's Pond, I; Long Lake, near Binford; North 

 Washington Lake; Wood Lake; Lake Isabelle; Lake X; South 

 Washington Lake. 



Order PROTOCOCCALES 

 Family Scenedesmaceae 



Genus oocystis Nag. 



Oocystis crassa Wittr. 



East Lake; Creel Bay, Devils Lake; Lamoreau Lake. 



O. Iacustris Chodat. 



Willow Lake; Spring Lake; Lake C. 



East Lak 



Hansg 



Genus tetraedron KUtz. 



limneticum B 



Strawberry Lake. 



T. quadricuspidatum (Reinsch) Hansg. PI. 21, fig. 13 



Carpenter Lake. 



A single triangular specimen, probably to be placed here 

 which possessed three stout spines and thickened convex sides 

 T. trigonum (Nag.) Hansg. 

 Strawberry Lake. 

 Var. gracile (Reinsch) De Toni. 

 Red Willow Lake. 



Genus scenedesmus Meyen 



Scenedesmus bijugatus (Turp.) Lagerh. 



Cut-off Pond. Stump Lake; Carpenter Lake; Willow Lake 

 Odessa, H; Lake P; Wood Lake. 



Var. alternans (Reinsch) Borge. 



Cut-off Pond, Stump Lake. 



Var. flexuosus Lemm. Snow in Bull. U. S. Fish Comm. 22: 

 375. pi. 1, f. 4. 1902. 



