142 Lake Maxinkuckee, Physical and Biological Survey 



6. COELOSPHAERIUM KUETZINGIANUM Naeg. 



A frequent element in the plankton, occurring in almost every 

 haul, both the vertical and towing-net hauls. Along with much 

 of the other plankton algse it was a common element in the food of 

 the freshwater mussels of the lake. 



7. MERISMOPEDIA GLAUCA (Ehren.) 



This is not a plankton alga and was usually found not far from 

 shore. It was occasionally found in material collected in Outlet 

 Bay not far from shore, and was taken in connection with Oscil- 

 latoria, (Edogonium, Bulbochaete, etc. This delicate plate-like form 

 is not well adapted for preservation and is best recognized when 

 fresh material is studied in the field. 



8. APHANOTHECA STAGNINA (Sprengel) 



Although very abundant in parts of the lake, this species does 

 not enter into the plankton but remains lying scattered over the 

 bottom, especially where it is peaty and firm, in the form of tough 

 blue-green jelly-like balls about the size of peas or larger. Some 

 was collected near shore August 29, 1900, and on the northwest 

 shore of Lost Lake, September 4. When placed in a vial of fresh 

 water it does not die and decay, as do most of the algse, but re- 

 tains its bright color and emits no odor. 



The colonies remained unchanged through the winter and were 

 frequently noted through the ice, lying on the bottom. In the bot- 

 tom of Outlet Bay, a little way out from shore the ground, a tough, 

 peaty soil, appeared to be covered with small pebbles from the size 

 of hazelnuts to a trifle larger. Upon scooping them up they proved 

 to be Aphanotheca. Some of the colonies were dark blue-green, 

 others more brownish or yellowish. We know nothing of its re- 

 lationships with the organisms of the lake. 



9. RIVULARIA NATANS (Hedw.) 



Rare in the lake ; not found in the plankton, and obtained only 

 once, in hand-gathered material from Outlet Bay, October 12, 1900. 



10. RIVULARIA ECHINULA (Smith) 



Rare ; a little found tangled up in brown and blue-green fila- 

 ments obtained from the south end of the lake, August 11, 1906. It 

 resembles pretty much the Rivularia natans which is so abundant, 

 free-floating, in Bass and Chapman lakes. One filament in the 

 colony examined showed the saccate base of "Gloiotrichia" which, 

 however, was not subdivided. The colony looks much like Apstein's 

 figure. 



