40 A CATALOG OF ILLINOIS ALGAE 



Bogota — creek 6 miles S.W. (Aug.). Lawrence, Pinkstaff — ponds, 

 small streams, bayous, and horsetrough (June, Aug., Oct.). 

 Agersborg 1930, p. 110: Macon, Decatur — warm waste-water 

 ditch (Dec.-Feb.). Kofoid 1903, p. 516; 1908, pp. 11, 35, 43, 55, 

 292, 318: Mason, Havana — Illinois River (all months); Topeka 

 — Quiver Creek (Sept.-Dec). Eddy 1931 B, p. 451, as Lysigonium 

 varians: Pulaski, Wetaug — sink-hole pond (Apr.). 



STEPHANODISCUS Ehrenberg, 1845 



S. ASTRAEA (Ehr.) Grun. Boyer, loc. cit., p. 61 (1927). 



Thomas & Chase 1887, p. 330: Cook, Chicago— Lake Michigan. 



S. ASTRAEA var. INTERMEDIA Fricke. Hustedt in Pascher, Suesswass.- 



fl. Mitteleur. 10: 110 (1930). 



Skvortzow 1937, p. 653: Cook, Chicago — Lake Michigan (Jan.). 



S. ASTRAEA var. MiNUTULA (Kuetz.) Grun. Boyer, Proc. Acad. Nat. Sci. 



Phila. 78(Suppl. 1): 61 (1927); Mills, Index Diat., p. 1482 (1934). 

 Stephanodiscus minutus Grun. 



Thomas & Chase 1887, p. 330; Jelliffe 1893, p. 311, as S. minutus; 

 Skvortzow 1937, p. 654: Cook, Chicago — Lake Michigan (Jan.). 



S. HANTZSCHii Grun. Hustedt in Pascher, Suesswass.-fl. Mitteleur. 10: 



110. f. 87 (1930). 



Skvortzow 1937, p. 654: Cook, Chicago — Lake Michigan (Jan.). 



S. NIAGARAE Ehr. Boycr, Proc. Acad. Nat. Sci. Phila. 78(Suppl. 1): 



61 (1927). 



Galtsoff 1924, pp. 399, 402, 404, 405, 410: Carroll— Mississippi 

 River (July, Sept.). Babcock 1872A, p. 13; 1872B, p. 104; Briggs 

 1872A, p. 44; Thomas & Chase 1887, p. 330; Jelliffe 1893, p. 311; 

 Eddy 1927B, pp. 208, 214, 219; Skvortzow 1937, p. 653: Cook, 

 Chicago — Lake Michigan (May-Sept., Jan.). Galtsoff, loc. cit. 

 (1924): Hancock, Henderson, Jo Daviess^ — Mississippi River 

 (July-Sept.). Kofoid 1908, pp. 43, 58: Mason, Havana — Illinois 

 River (May). Galtsoff, loc. cit. (1924): Mercer, Rock Island, 

 Whiteside — Mississippi River (July-Sept.). 



S. NIAGARAE var. MAGNIFICA Fricke. Skvortzow, Amer. Midi. Nat. 18: 



653 (1937). 



Skvortzow 1937, p. 653: Cook, Chicago — Lake Michigan (Jan.). 



Family: EUPODISCACEAE 

 ACTINOCYCLUS Ehrenberg, 1837 



A. NIAGARAE H. L, Smith. Boyer, Proc. Acad. Nat. Sci. Phila. 78 

 (Suppl. 1): 86 (1927). 



Thomas & Chase 1887, p. 328: Cook, Chicago — Lake Michigan. 



