CLASSIFIED CATALOG OF ILLINOIS ALGAE 153 



Mason, Havana — Illinois River (all months). Massac — Ohio 

 River (June). McHenry, Algonquin — Fox River ("summer"); 

 McHenry— swamp E. of McCullom Lake, July 6, 1939, #380, 

 385 ; Ridgefield— small pond, July 7, 1939, #418. Menard, Peters- 

 burg — Sangamon River (June, July, Sept.). Monroe — Missis- 

 sippi River (June). Ogle, Grand Detour— slough (June-Aug.). 

 Piatt, Monticello — Sangamon River (May-Sept.). Pike — Missis- 

 sippi River (June). Pulaski — Ohio River (June); Wetaug — sink- 

 hole ponds (Apr., July, Sept., Dec). Randolph — Mississippi 

 River (June). Sangamon, Illiopolis, Riverton, Springfield — 

 Sangamon River (June-Sept.). St. Clair— Mississippi River 

 (June). Union, Larue— Wolf Lake (June-Aug.). Wabash, Mt. 

 Carmel— Wabash River (Apr.). Whiteside, Erie — Hatwood and 

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

 mer"). 



Order: COLACIALES 



Family: COLACIACEAE 



COLACIUM Ehrenberg, 1833 



CALVUM Stein. Walton, loc. cit., p. 401. pi. 21. f. 15 (1915). 



Kofoid 1908, p. 72: Mason, Havana — Illinois River (Apr.-Oct.). 

 VESicuLOSUM Ehr. Walton, loc. cit., p. 400. f. 13 (1915). 



Kofoid 1908, p. 72: Mason, Havana — Illinois River (June, Sept.) 



