96 A CATALOG OF ILLINOIS ALGAE 



O. ROTHii Pringsh. Tiffany, loc. ciL, p. 67. pi. 24. f. 380 (1937). 



Britton : Kankakee, Kankakee — 5 miles N. in slough along Route 



49, Apr. 18, 1938, #5. 

 O. RUFESCENS Wittr. Tififany, loc. ciL, p. 28. pi. 8. f. 100-102 (1937). 



Transeau 1913B, p. 85; 1913C, p. Z2>; 1916, p. 124: Clark, Casey, 



Oilfield — ponds (Apr., May). Coles, Ashmore, Charleston, Lerna 



— ponds, pools, ditches and small streams (Mar.-May, Nov.). 



Douglas, Arthur — pond and pool (May). Effingham, Effingham 



—pond (Dec). Tiffany 1930, p. 66; 1937, p. 28. 

 O. RUFESCENS var. EXIGUUM (Elfv.) Tiff. Tiffany, loc. cit., f. 105 

 (1937). 



Transeau 1913B, p. 85; Collins 1918, p. 62: Coles, Ashmore, 



Charleston — ponds and pools (Apr., May). Lawrence, Lawrence- 



ville— gravel pit (Apr.). Tiffany 1930, p. 66; 1937, p. 28; 1939, 



p. 91. 

 O. RUFESCENS var. LUNDELLii (Wittr.) Tiff. Tiffany, loc. cit., f. 106, 

 107 (1937). 



Transeau: Coles, Ashmore, Charleston — ponds (Apr., May). 

 O. RUGULOSUM Nordst. Tiffany, loc. cit., p. 68, pi. 24. f. 376, 377 

 (1937). 



Transeau: Coles, Ashmore — ponds and pools (May, June). 



Tiffany 1937, p. 68; 1939, p. 91. 

 O. RUGULOSUM var. minutum (Hansg.) Tiff. Tiffany, loc. cit., p. 69. 

 pi. 24. f. 378 (1937). 



Transeau 1913B, p. 85: Coles, Ashmore — pond (May, Oct.). 



Moultrie, Sullivan^artificial pond (July). Tiffany 1930, p. 149; 



1937, p. 69. 

 O. SIMPLEX Hirn. Tiffany, Oedog. Monog., p. 111. pi. 26. f. 340 (1930). 



Transeau: Jasper, Wheeler — pond (Sept.). 

 O. sociALE Wittr. Tiffany, N. Am. Fl. 11: 28. pi. 8. f. 95, 96 (1937). 



Collins 1912, p. 84; Transeau 1913B, p. 85: Clark, Casey— ponds 



(Apr., May). Coles, Charleston, Wrightsville — ^ponds, pools, and 



creek (Apr., May). Cumberland, Jewett — pond (May). Tiffany 



1930, p. 67; 1937, p. 28; 1939, p. 91. 

 O. SUBPLENUM Tiff. Tiffany, loc. cit., p. 77. pi. 27. f. 428, 429 (1937). 

 Oedogonium areschoughii var. americaniim Tiffany 



Tiffany 1927, p. 205 ; 1930, p. 140, as 0. a. var. americanum; 1937, 



p. 77; 1939, p. 91: Jackson, DeSoto— small lake (May). 

 O. SUECICUM Wittr. Tiffany, loc. cit., p. 29. pi. 8. f. 93 (1937). 



Transeau 1913B, p. 85; 1916, p. 124: Clark, Casey— pond (May). 



Coles, Charleston, Lerna— ponds (May, June). Lawrence, 



Lawrenceville— gravel pit (Apr.). Tiffany 1930, p. 68; 1937, 



p. 29; 1939, p. 91. 



