56 A CATALOG OF ILLINOIS ALGAE 



N. iRiDis var. firma (Kuetz.) V. H. Mills, Index Diat., pp. 1070, 

 1189 (1934). 



Navicula iridis var. firma (Grun.) Kuetz. 



Thomas & Chase 1887, p. 329, as Navicula i. var. firma: Cook, 

 Chicago — Lake Michigan. 

 N. PRODUCTUM (W. Sm.) Pfitz. Boyer, Proc. Acad. Nat. Sci. Phila. 79 

 (Suppl. 2): 321 (1927); Mills, loc. cit., pp. 1070, 1190 (1934). 



Navicula iridis var. affinis (Ehr.) V. H.; Navicula iridis var. pro- 

 ducta (W. Sm.) V. H. 



Thomas & Chase 1887, p. 329, as Navicula i. var. afflnis and N. i. 

 var. producta: Cook, Chicago — Lake Michigan. 



PINNULARIA Ehrenberg, 1840 



P. APPENDicuLATA (Ag.) C. Boyer, loc. cit., p. 432 (1927). 

 Navicula appendiculata Kuetz. 



Thomas & Chase 1887, p. 329, as Navicula appendiculata: Cook, 



Chicago — Lake Michigan. 

 P. BRAUNii (Grun.) CI. Boyer, loc. cit., p. 433 (1927). 



Transeau: Cumberland, Greenup — ditch (Nov.). 



P. BREBissoNii (Kuetz.) Rab. Boyer, loc. cit., p. 435 (1927). 

 Navicula hrehissonii Kuetz. 



Transeau: Coles, Charleston — small streams (Jan., Apr.). 



Thomas and Chase 1887, p. 329, as Navicula hrehissonii: Cook, 



Chicago — Lake Michigan. 

 P. BREVicosTATA var. LEPTOSTAURON CI. Mills, Index Diat., p. 1274 

 (1927). 



Transeau: Coles, Charleston — pond (Apr.). 

 P. CARDiNALis (Ehr.) W. Smith. Hustedt in Pascher, Suesswass.-fl. 

 Mitteleur. 10:337. f. 621 (1930) ; Mills, /oc. a/., pp. 1002, 1275(1934). 

 Navicula cardinalis Ehr. 



Thomas & Chase 1887, p. 329, as Navicula cardinalis: Cook, 



Chicago — Lake Michigan. 

 P. DIVERGENS W. Smith. Boyer, Proc. Acad. Nat. Sci. Phila. 79 

 (Suppl. 2): 435 (1927); Mills, loc. cit., pp. 1029, 1279 (1934). 

 Navicula divergens Ralfs 



Thomas & Chase 1887, p. 329, as Navicula divergens: Cook, Chi- 

 cago — Lake Michigan. 

 P. GiBBA (V. H.) Boy. Boyer, loc. cit., p. 440 (1927). 

 Navicula gihha Kuetz. 



Transeau: Coles, Charleston — pond (Apr.). Thomas & Chase 



1887, p. 329, as Navicula gihha: Cook, Chicago— Lake Michigan. 



