134 A CATALOG OF ILLINOIS ALGAE 



(Sept.). Madison — Mississippi River (June). Mason, Havana — 

 Illinois River (all months) ; Topeka — Quiver Creek (Sept.-Nov.). 

 McHenry, Algonquin — Fox River ("summer"). Menard, Peters- 

 burg — Sangamon River (Sept.). Ogle, Byron, Grand Detour — 

 sloughs (June-Aug.). Piatt, Monticello — Sangamon River (May- 

 Nov.). Pike — Mississippi River (June). Pulaski, Wetaug — sink- 

 hole ponds (Apr., July, Sept., Dec.). St. Clair — Mississippi River 

 (June). Union, Larue — Wolf Lake (June-Aug.). Whiteside, Erie 

 — Hatwood Slough (June-Aug.); Sterling — Rock River ("sum- 

 mer"). 



C. ACEROSUM var. elongatum Breb. West & West, loc. ciL, p. 148. f. 1 



(1904). 



Britton 1940, p. 71: Cook, Morton Grove — small pond about 1 

 mile N.W., May 10, 1938, #43. 



C. ACUTUM Breb. West & West, loc. ciL, p. 177. pi. 23. f. 9-14 (1904). 

 Eddy 1931 A, pp. 480, 483, 486: Cass, Chandlerville — Sangamon 

 River (Sept.). Macon — Lake Decatur (June, Sept.); Harristown 

 —Sangamon River (Sept.). Menard, Petersburg— Sangamon 

 River (Sept.). Piatt, Monticello — Sangamon River (July). San- 

 gamon, Illiopolis, Riverton, Springfield — Sangamon River 

 (Sept.). 



C. BRAUNii Reinsch. Krieger in Rab., Kryptog.-fl. Deutsch. 13(1): 



343. pi. 30. f. 2 (1937). 



Transeau: Clark, Casey — pond (May). 



C. DiANAE Ehr. West & West, Brit. Desmid. 1: 130. pi. 15. f. 1-6 



(1904). 



Johnson & Atwell 1890, p. 20: Cook— "Big Woods" (Apr.). 



C. DIDYMOTOCUM Ralfs. Krieger in Rab., Kryptog.-fl. Deutsch. 13(1): 



325. pi. 26. f. 1-2 (1937). 



Transeau: Clark, Casey — pond (May). 



C. EHRENBERGii Meucgh. Wcst & Wcst, Brit. Desmid. 1: 143. pi. 17. 



f. 1-4 (1904). 



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



C. GRACILE Breb. West & West, loc. ciL, p. 166. pi. 21. f. 8-12 (1904). 

 Kofoid 1903, p. 516; 1908, pp. 61, 292, 319: Mason, Havana- 

 Illinois River (Mar.-Dec); Topeka — Quiver Creek (Dec, Jan.). 



C. GRACILE var. ELONGATUM W. & G. S. Wcst. West & West, loc. cit., 



p. 168. f. 14-16 (1904). 



Eddy 1931B, p. 462: Pulaski, Wetaug — sink-hole pond (Dec). 



C. INTERMEDIUM Ralfs. Krieger in Rab., Kryptog.-fl. Deutsch. 13: 



335. pi. 28, 29. f. 5, 6, 8 (1937). 



Closterium striolatum var. intermedium Ehr.; C. subtruncatiim West 

 & West. 



Johnson & Atwell 1890, p. 20, as C. s. var. intermedium: Cook — 



