1923] 



MOORE AND CARTER — ALGAE FROM NORTH DAKOTA LAKES 415 



Genus selenastrum Reinsch 



Selena strum gracile Reinsch. 



Strawberry Lake. 



S. Westii G. M. Smith, Wis. Geol. & Nat. Hist. Surv. Bull. 67: 

 133. pl.81,f. 10. 1920. 

 Strawberry Lake. 



Genus ankistrodesmus Corda 



Ankistrodesmus falcatus (Corda) Ralfs. 



Dion Lake. 



A. spiralis (Turn.) Lemm. 



Strawberry Lake; Cut-off Pond, Stump Lake. 



Genus kirchneriella Schmidle 



Kirchneriella obesa (West) Schmidle. 

 Red Willow Lake. 



Var. aperta (Teiling) Brunnthaller. 

 Rare in Strawberry Lake. 



K. lunaris (Kirchn.) Mobius, var. irregularis G. M. Smith, 

 Wis. Geol. & Nat. Hist. Surv. Bull. 57: 142. pi 35, /. 1. 1920. 



Florence Lake. 



Genus coelastrum Nag. 



Coelastrum microporum Nag. 



Cut-off Pond, Stump Lake; Spiritwood I, Bay; Coe Lake; 

 Red Willow Lake. 



C. cambric um Arch. 



Strawberry Lake. 



Genus sorastrum Kilts. 



Sorastrum spinulosum Nag. 

 Cut-off Pond, Stump Lake. 



Genus dictyosphaerium Nag. 



Dictyosphaerium Ehr enb ergianum Nag. 



Strawberry Lake; Creel Bay, Devils Lake. 



D. pulchellum Wood. 



Strawberry Lake; Juanita Lake; Clear Lake; Creel Bay, Devils 



Lake. 



