CLASSIFIED CATALOG OF ILLINOIS ALGAE 53 



M. SMiTHii var. amphicephala Grun. Boyer, loc. cit. (1927). 



Thomas & Chase 1887, p. 329: Cook, Chicago — Lake Michigan. 

 M. SMITHII var. lacustris Grun. Boyer, loc. cit. (1927). 



Thomas & Chase 1887, p. 329: Cook, Chicago— Lake Michigan. 



NAVICULA Bory, 1822; Cleve, 1894 



N. AMBiGUA Ehr. Mills, Index Diat., p. 974 (1934). 

 Navicula ambigua f. craticularis 



Transeau: Coles, Charleston — small streams (May, Oct.). 



Thomas & Chase 1887, p. 329, also as N. a. f. craticularis: Cook, 



Chicago — Lake Michigan. 

 N. ANGLICA Ralfs. Boyer, Proc. Acad. Nat. Sci. Phila. 79 (Suppl. 2): 

 384 (1927). 



Navicula tumida W. Smith 



Briggs 1872A, p. 44, as N. tumida: Thomas & Chase 1887, p. 329: 



Cook, Chicago— Lake Michigan. 

 N. BACILLUM Ehr. Boyer, loc. cit., p. 371 (1927). 



Ahlstrom 1936, p. 292: Cook, Evanston— Lake Michigan. 

 N. CONFERVACEA (Kuetz.) Grun. Boyer, loc. cit., p. 370 (1927). 



Galtsoff 1924, p. 399: Hancock, Henderson — Mississippi River 



(July). 



N. CRYPTOCEPHALA Kuetz. Boyer, loc. cit., p. 383 (1927). 



Baker 1922, p. 80: Champaign, Urbana — Boneyard Creek. 

 Transeau: Coles, Ashmore — pond (Nov.); Charleston — pond 

 and small streams (Jan.-May, Nov.); Embarrass — small stream 

 (Mar.); Wrightsville — in a spring (Apr.). Briggs 1872A, p. 44; 

 Thomas & Chase 1887, p. 329; Ahlstrom 1936, p. 292: Cook, 

 Chicago, Evanston — Lake Michigan. Transeau: Lawrence, 

 Pinkstaff — (Nov.). 



N. CUSPIDATA Kuetz. Boyer, loc. cit. (1927). 



Transeau : Coles, Charleston — ponds, ditches and small streams 

 (Mar .-May, Nov.). Thomas & Chase 1887, p. 329: Cook, Chi- 

 cago — Lake Michigan. 



N. DiCEPHALA (Ehr.) W. Smith. Boyer, loc cit., p. 386 (1927). 



Thomas «& Chase 1887, p. 329: Cook, Chicago— Lake Michigan. 



N. DICEPHALA var. ELGiNENSis (Greg.) CI. Hustedt in Pascher, 



Suesswass.-fl. Mitteleur. 10: 303 (1930). 

 Transeau: Coles, Loxa — ditch (Apr.). 



N. EXIGUA (Greg.) Muell. Hustedt, loc. cit., p. 305. f. 538 (1930). 

 Ahlstrom 1936, p. 292: Cook, Evanston — Lake Michigan. 



M. GASTRUM Ehr. Boyer, Proc. Acad. Nat. Sci. Phila. 79 (Suppl. 2) : 



389 (1927). 



Navicula varians Greg. 



Thomas & Chase 1887, p. 330, as N. varians; Ahlstrom 1937, 

 p. 292: Cook, Chicago, Evanston — Lake Michigan. 



