CLASSIFIED CATALOG OF ILLINOIS ALGAE 113 



MICRACTINIUM Fresenius, 1858 



M. PUSILLUM Fresen. Tiffany, loc. cit., p. 72. pi. 12. f. 301 (1934); 



Smith, Bull. Wis. Geol. & Nat. Hist. Surv. 57(1): 125. pi. 28. f. 1-3 



(1920). 



Richteriella hotryoides (Schmid.) Lemm. 



Eddy 1931A, p. 486: Cass, Chandlerville — Sangamon River 

 (Sept.). Ahlstrom 1936, p. 293: Cook, Evanston— Lake Michi- 

 gan. Kofoid 1908, pp. 23, 30, as Richteriella hotryoides: Mason, 

 Havana — Illinois River (May-Nov.). Britton: McHenry, Green- 

 wood — Nippersink Creek, July 7, 1939, #432. Eddy, loc. cit.: 

 Menard, Petersburg — Sangamon River (Sept.). 



M. QUADRiSETUM (Lemm.) G. M. Smith. Tiffany, loc. cit., f. 302 



(1934). 



Ahlstrom 1936, p. 293: Cook, Evanston — Lake Michigan. 



SCENEDESMUS Meyen, 1829 



S. ABUNDANS (Kirch.) Chod. Smith, Trans. Wis. Acad. Sci. 18: 465. 



pi. 30, 31. f. 133-140 (1916). 



Scenedesmus quadricauda var. abundans Kirch. 



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

 Transeau 1913B, p. 80, as 6". q. var. abundans: Coles. 



S. ABUNDANS var. LONGICAUDA Smith. Smith, loc. cit., p. 467. pi. 30, 



f. 121-125 (1916). 



Britton: Cook, Evanston — small pond in Calvary Cemetery, 

 June 23, 1938, #74; E. pond in Memorial Park Cemetery, June 

 27, 1938, #104. 



S. ACUMINATUS (Lag.) Chod. Smith, loc. cit., p. 437. pi. 25. f. 3-5 



(1916). 



Selenastrum acuminatum Lag. 



Transeau 191 3B, p. 80, as Selenastrum acuminatum: Coles, 

 Charleston — ponds. Britton: Cook, Sag Bridge — swamp, July 

 13, 1939, #502. Galtsoff 1924, pp. 399, 402: Hancock— Lake 

 Keokuk — Mississippi River (July). Henderson — Mississippi 

 River (July, Aug.). 



S. ACUTiFORMis Schroed. Smith, loc. cit., p. 456. pi. 26, 29. f. 28, 29, 



84-89 (1916). 



Britton 1940, p. 71: Cook, Glenview — swamp and temporary 

 pond about H miles W., May 12, 1938, #56; Morton Grove^ 

 small pond about 1 mile N.W., May 10, 1938, #43; Sag Bridge- 

 small pond and extensive swamp, Sept. 8, 1939, #1016. Lake, 

 Waukegan — in Dead River at Dunes Park, May 11, 1939, #255. 



S. ARCUATUS Lemm. Smith, loc. cit., p. 449. pi. 26, 29, 30. f. 19, 20, 



94-100 (1916). 



Ahlstrom 1936, p. 293; Britton: Cook, Evanston— Lake Michi- 



