42 A CATALOG OF ILLINOIS ALGAE 



119, 124, 132, 134, 145, 156 (Fulton, La Salle, Marshall, Mason, 

 Peoria, Will). Daily 1938, p. 74, 79 (Cook). 



Cook, Chicago, Evanston — Lake Michigan (all months). Ful- 

 ton — Spoon River (Sept.-Nov.). Grundy, Dresden Heights — 

 DesPlaines and Illinois Rivers (July-Sept.). La Salle, La Salle, 

 Marseilles — Illinois River (July-Nov.). Marshall, Henry — 

 Illinois River. Mason, Havana — Illinois River (Mar.-May). 

 Peoria, Chillicothe, Peoria — Illinois River (all months). Will, 

 Joliet — DesPlaines River (Mar .-Aug.); Lockport — Chicago 

 Drainage Canal. 



Family: MERIDIONACEAE 

 MERIDION Agardh, 1824 



M. CIRCULARE (Grev.) Ag. Boyer, loc. cit., p. 172 (1927); Mills, loc. 



ciL, p. 956 (1934). 



Meridian circulare var. zinkenii (Kuetz.) Grun. 



Transeau 1913B, p. 73, as M. c. var. zinkenii: Coles, Ashmore — 

 in a spring (May); Charleston, Dorans, Lerna, Loxa — small 

 streams, ditches, draintile, and ponds (Mar.-May, Oct., Nov.). 

 Thomas & Chase 1887, p. 329: Cook, Chicago^ — Lake Michigan. 

 Transeau: Lawrence, Pinkstaff — pond (Nov.). Kofoid 1903, 

 p. 516; 1908, pp. 43, 57: Mason, Havana — Illinois River (Dec- 

 Mar.); Topeka — Quiver Creek (Apr.). 



M. CIRCULARE var. CONSTRICTA (Ralfs) V. H. Hustedt in Pascher, 



Suesswass.-fl. Mitteleur. 10: 131. f. 119 (1930); Mills, loc. cit., pp. 



956, 957 (1934). 



Meridian canstrictum Ralfs. 



Transeau, as M. canstrictum: Coles, Charleston — small stream 

 (Mar.). Agersborg 1930, p. 106, as il/. canstrictum: Macon, Deca- 

 tur — warm waste-water ditch (Dec.-Feb.). 



Family: DIATOMACEAE 



DIATOMA DeCandolle, 1805 



D. ANCEPS (Ehr.) Kirch. Boyer, Proc. Acad. Nat. Sci. Phila. 78 

 (Suppl. 1): 176 (1927). 



Thomas & Chase 1887, p. 328: Cook, Chicago — Lake Michigan. 

 D. ELONGATUM var. TENUIS (Ag.) V. H. Boyer, loc. cit. (1927). 



Kofoid 1908, pp. 43, 49, 292, 317: Mason, Havana— Illinois 



River (all months). 

 D. HiEMALE (Lyngb.) Heib. Hustedt in Pascher, Suesswass.-fl. 

 Mitteleur. 10: 129. f. 115 (1930); Mills, Index Diat., p. 590 (1934). 

 Diatoma hiemale var. genuina Grun. 



Transeau, as D. h. var. genuina: Lawrence, Pinkstaff — pond 



(Nov.). 



