70 ILLINOIS ACADEMY OF SCIENCE 



burg. Vol. 3, Algen. (Schizophyceen, Flagellaten, Peri- 

 dineen) Leipsig, 1910. 



7. F. Oltmanns, Morphologic and Biologic der Algen. Two 



Vols. Jena, 1904. 



8. A. Pasher, Die Siicsswasserflora Dcutschlands, Oester- 



reichs iind der Schweiz, Jena, 1912. 



Schizophyceae 

 Chroococcaceae 



Chroococcus turgidus (Kuetzing) Naegeli. 



Ponds. Seen in many collections but always in small 

 numbers. 

 Aphanocapsa brunnea (A. Braun) Naegeli. 



Abundant in the East Tile Factory pond, Charleston, 

 July, 1909. 

 Aphanothece stagnina (Spreng) A. Braun. 



Common in summer and autumn in the Tile Factory 

 ponds, and the east Big Four pond, Charleston. 

 Clathrocystis aeruginosa Henfrey. 



Very abundant in a small pond adjoining the reservoir, 

 Casey, September, 1912. 

 Coelosphaerium Kuetzingianum Naegeli. 



At times an important constitutent of the plankton in the 

 Tile Factory and east Big Four ponds, Charleston. 

 Merismopaedium convolutum Brebisson 



Abundant in the summer plankton of the Tile Factory 

 and Hodgen's ponds. 

 Merismopaedium tennuissimum Lemmermann. 



Common in the new Tile Factory pond, Charleston, Sep- 

 tember, 1911. 



Oscillatoriaceae 



Oscillatoria Agardhii Gomont. 



Found in pond near the Casey reservior, September, 1912. 

 Fide Collins. 

 Oscillatoria amphibia Agardh. 



In ponds and streams, occasionally abundant. In the Ice 

 Plant pond, Casey, it was found in the hot water near 

 the steam exhaust. It has been recorded from the east 

 Big Four pond, and the Town Branch near Charleston. 

 Fide Collins. 

 Oscillatoria formosa Bory. 



Found in ponds near Charleston and Casey. Fide Collins. 

 Oscillatoria limosa Agardh. 



Very abundant during low water stages in streams, 

 stream pools, and ponds. Common in streams polluted 

 by sewage. Found at all seasons of the year locally 

 abundant. 



