CLASSIFIED CATALOG OF ILLINOIS ALGAE 63 



q. PROSTRATA (Berk.) CI. Boyer, loc. cit., p. 285 (1927); Mills, Index 



Diat., p. 564 (1934). 



Encyonema prostratum Ralfs 



Thomas & Chase 1887, p. 328; Eddy 1927B, pp. 208, 221, as 

 Encyonema prostratum: Cook, Chicago — Lake Michigan (Oct., 

 Nov.). Kofoid 1908, p. 50, as Encyonema prostratum: Mason, 

 Havana — Illinois River. 



C. TRIANGULUM (Ehr.) CI. Boyer, loc. cit., p. 284 (1927). 

 Cymhella rotundata Chase; Encyonema triangulum Kuetz. 



Transeau: Coles, Charleston — Indian Creek and other small 

 streams (Mar.-May, Oct., Nov.) ; Dorans — ditch (May). Thomas 

 & Chase 1887, p. 328, as C. rotundata and Encyonema triangulum: 

 Cook, Chicago^ — Lake Michigan. 



C. TUMiDA (Breb.) V. H. Boyer, loc. cit., p. 280 (1927); Mills, Index 



Diat., pp. 443, 568 (1934). 



Cymhella stromatophora Grun.; Cocconema cymbiforme Rab. 



Transeau, as Cocconema cymbiforme: Coles, Charleston — pond 

 (Apr.). Briggs 1872 A, p. 43, as Cocconema cymbiforme ; Thomas & 

 Chase 1887, p. 328, as C. stromatophora: Cook, Chicago — Lake 

 Michigan. 



C. TURGIDA Greg. Boyer, loc. cit., p. 283 (1927). 

 Transeau: Clark — Whetstone Creek (Oct.). 



C. VENTRicosA Kuetz. Boyer, loc. cit., p. 285 (1927), 

 Encyonema caespitosum Kuetz. ; E. ventricosum Kuetz. 



Transeau: Coles, Charleston — Indian Creek and other small 

 streams and ponds (Oct., Nov.). Briggs 1872A, p. 43, also as 

 Encyonema caespitosum; Thomas & Chase 1887, p. 328, as En- 

 cyonema caespitosum and Encyonema ventricosum; Jelliffe 1893, 

 p. 310, as Encyonema ventricosum: Cook, Chicago — Lake Michi- 

 gan. 



EPITHEMIA Brebisson, 1838 



E. ARGUS (Ehr.) Kuetz. Boyer, loc. cit., p. 489 (1927). 



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



E. ARGUS van alpestris (W. Sm.) Grun. Hustedt in Pascher, 



Suesswass.-fl. Mitteleur. 10: 383. f. 727b (1930). 



Epithemia alpestris W. Smith; Epithemia argus var. amphicephala 

 Grun. 



Briggs 1872A, p. 43, as E. alpestris; Thomas & Chase 1887, p. 

 328, as E. argus var. amphicephala: Cook, Chicago — Lake Michi- 

 gan. 



E. muelleri Fricke. Hustedt, loc. cit., p. 384. f. 728 (1930). 

 Ahlstrom 1936, p. 291: Cook, Evanston — Lake Michigan. 



