116 A CATALOG OF ILLINOIS ALGAE 



1845, p. 34, as Arthrodesmus acutus: St. Clair — Mississippi 

 River. 



S. opoLiENsis Richt. Smith, loc. cit., p. 481. pi. 27, 32. f. 49, 181-184 



(1916). 



Britton: Cook, Park Ridge — DesPlaines River at Touhy Ave., 

 July 12, 1939, #452. Lake, Fox Lake— in Fox Lake, Aug. 25, 

 1939, #950. 



S. PROTUBERANS Fritsch & Rich. Tiffany, Contrib. Franz T. Stone 



Lab. 6: 68. pi. 12. f. 295 (1934). 



Britton: Cook, Sag Bridge— swamp, Sept. 8, 1939, #984; Wheel- 

 ing— DesPlaines River at Dam #1 (Hintz Road), Aug. 8, 1939, 

 #777. 



S. QUADRICAUDA (Turp.) Breb. Smith, Trans. Wis. Acad. Sci. 18: 473. 



pi. 27, 31, 32. f. 39, 172-176 (1916). 



Scenedesmus caudatus Corda; 5. genuinus Kirch.; Arthrodesmus 

 quadricaudatus Ehr. 



Bailey 1845, p. 34, as Arthrodesmus quadricaudatus (St. Clair). 

 Johnson & Atwell 1890, p. 19; Jelliffe 1893, p. 311, as S. caudatus 

 (Cook). Kofoid 1908, pp. 23, 31, 292, 316, also as 5. genuinus 

 (Mason). Transeau 1913B, p. 80; 1913C, p. 36; 1916, p. 125 

 (Coles, Edgar, Moultrie). Galtsoff 1924, pp. 399, 401, 402, 404, 

 405 (Carroll, Hancock, Henderson, Jo Daviess, Mercer, Rock 

 Island, Whiteside). Eddy & Simer 1929, p. 62 (Morgan). Eddy 

 1931A, pp. 480, 483, 476 (Cass, Macon, Menard, Sangamon); 

 1931B, p. 461 (Pulaski); 1934, pp. 385, 386, 388-395, 397, 399, 

 400, 402, 403 (Adams, Alexander, Calhoun, Champaign, Han- 

 cock, Henry, Jackson, Jersey, Macon, Madison, Mason, Massac, 

 McHenry, Monroe, Ogle, Piatt, Pike, Pulaski, Randolph, St. 

 Clair, LInion, Whiteside). Britton (Cook, Lake). 



Adams, Mississippi River (June). Alexander — Mississippi and 

 Ohio Rivers (June); Horseshoe Lake (June-Aug.). Calhoun, 

 Carroll — Mississippi River (June-Sept.). Cass, Chandlerville — 

 Sangamon River (Sept.). Champaign, Seymour — temporary 

 pond (Feb.-July); Urbana — park pond (all months). Coles, 

 Charleston — ponds (Apr.-Nov.). Cook, Chicago — Lake Michi- 

 gan; Evanston — aquarium (Mar.), small greenhouse reservoir, 

 June 23, 1938, #75. Edgar, Paris^ — reservoir (July). Hancock, 

 Henderson — Mississippi River (June-Aug.). Henry, Colona — 

 slough (June-Aug.). Jackson, Jersey, Jo Daviess — Mississippi 

 River (June-Sept.). Lake, Waukegan— ditch, July 29, 1938, 

 #173. Macon, Decatur — park pond (Aug.-Oct.), Lake Decatur 

 (Mar .-Nov.); Harristown — Sangamon River (June-Sept.). Mad- 

 ison — Mississippi River (June). Mason, Havana — Illinois River 

 (all months). Massac — Ohio River (June). McHenry — Fox 



