66 



THE LIFE OF DEVILS LAKE 



Mission Lake in 1923, tho the total solid concentration of the latter 

 at this time was 32600 ppm. 



Var. major has been reported from Lamoreau Lake. 



Figure 20. Seasonal distribution of Nodularia in millimeters in East Lake. 



Tolypothrix lanata. "Found in two collections growing with 

 other algae attached to twigs near shore." 



Calothrix hraunii. "Collected but once, growing on a single 

 large boulder." 



Calothrix fusca. Reported from Main Lake. 



Calothrix parietina. "Slightly incrusted, forming brownish 

 patches on small stones near shore." 



Gloetrichia natans. "Several large masses in one towing." 



CHLOROPHYCEAE 



Closterium occurs occasionally in the plancton samples from 

 Main Lake from July 1 to October 24,* but the species has not been 

 determined. Both C. dianae and its variety (arcuatum) have been 

 found in Lake P. 



Cosniarium. Three species of this genus (formulosum, scop- 

 ularum and sub-costatum have been taken in Lake P. 



Staurastrum sp. occurs occasionally in the plancton of Main 

 Lake from May 31 to Dec. 13. The dates for both Closterium and 

 Staurastrum are significant only in so far as indicating an extensive 

 seasonal distribution for both. 



Mougeotia sp. "Found near shore in three collections . . . 

 with Tolypothrix and Anabaena. " 



Pandorina morum. Reported from Main Lake. 



Pandorina sp. An indeterminate Pandorina has also been re- 

 ported from East Lake. 



*See below, under Staurastrum. 



