CLASSIFIED CATALOG OF ILLINOIS ALGAE 51 



C. siLicuLA var. undulata (Grun.) CI. Mills, loc. cit., pp. 329, 1084 

 (1934). 



Navicula limosa var. undulata Grun. 



Thomas & Chase 1887, p. 329, as Navicula I. var. undulata: 

 Cook, Chicago— Lake Michigan. 



C. TRiNODis (Lew.) Meist. Boyer, Proc. Acad. Nat. Sci. Phila. 79 

 (SuppL 2): 309 (1927). 



Navicula trinodis Lewis 



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

 1887, p. 330, as Navicula trinodis: Cook, Chicago — Lake Michi- 

 gan. 



DIPLONEIS Ehrenberg, 1844 



D. ELLiPTiCA (Kuetz.) CI. Boyer, loc. cit., p. 355 (1927). 

 Navicula elliptica Kuetz. 



Briggs 1872A, p. 44; Thomas & Chase 1887, p. 329, as Navicula 

 elliptica: Cook, Chicago — Lake Michigan, 



D. PUELLA (Schum.) CI. Boyer, loc. cit. (1927). 

 Navicula elliptica var. minutissima V. H. 



Thomas & Chase 1887, p. 329, as Navicula e. var. minutissima: 

 Cook, Chicago— Lake Michigan. 



FRUSTULIA Agardh, 1824; Grunow, 1865 



F. RHOMBOiDEs (Ehr.) DeToni. Boyer, loc. cit., p. 301 (1927). 

 Navicula rhomboides Ehr.; Vanheurckia rhomboides (Ehr.) Breb. 

 Briggs 1872A, p. 44; Thomas & Chase 1887, p. 329, as Navicula 

 rhomboides: Cook, Chicago^ — Lake Michigan. Agersborg 1930, 

 p. 106, as Vanheurckia rhomboides: Macon, Decatur — warm 

 waste-water ditch (Dec.-Feb.). 



F. viRiDULA (Breb.) DeToni. Boyer, loc. cit. (1927). 

 Schizonema viridulum Breb. 



Thomas & Chase 1887, p. 330, as Schizonema viridulum: Cook, 

 Chicago — Lake Michigan. 



F. VULGARIS (Thw.) DeToni. Boyer, loc. cit., p. 302 (1927); Mills, 



Index Diat., pp. 760, 1437 (1934). 

 Schizonema vulgare Thw. 



Transeau: Clark — Whetstone Creek (Oct.). Coles, Charleston — 

 small streams (Jan., Mar., Oct.). Thomas & Chase 1887, p. 330, 

 as Schizonema vulgare: Cook, Chicago — Lake Michigan. 





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