36 A CATALOG OF ILLINOIS ALGAE 



D. PEDiFORME (Lemm.) Stein. Ahlstrom, loc. cit., p. 146. pi. 1. f. 37- 



45 (1937). 



Dinobryon cylindricum var. pediforme Lemm. 



Kofoid 1908, p. 78, as D. c. pediforme: Mason, Havana — Illinois 

 River. 



D. SERTULARIA Ehr. Ahlstrom, loc. cit., p. 149. pi. 2. f. 1-16 (1937). 

 Dinobryon sertularia var. thyrsoideum (Chod.) Lemm. 



Jelliffe 1893, p. 311 (Cook). Hempel 1898, p. 323; Kofoid 1908, 

 pp. 73, 74, 78, 320, also as D. s. var. thyrsoideum (Mason). Eddy 

 1927B, pp. 209, 216, 225 (Cook); 1931A, pp 479, 481 (Cass, 

 Macon, Sangamon); 1931B, pp. 451, 464 (Pulaski); 1934, p. 46 

 (Cook). Britton (Cook, Lake). 



Cass, Chandlerville — Sangamon River (June). Cook, Chicago 

 — Lake Michigan (July, Aug.); Glenview— swamps and tempo- 

 rary ponds about 1| miles W., May 12, 1938, Apr. 7, 1939, #56, 

 228; Park Ridge — shallow pond at Dempster St. and Milwaukee 

 Ave., June 23, 1938, #84. Lake, Waukegan— in Dead River at 

 Dunes Park, May 11, 1938, #255-257. Macon— Lake Decatur 

 (June, July); Harristown^ — Sangamon River (June, July). 

 Mason, Havana — Illinois River (Nov.-June). Pulaski, Wetaug 

 — sink-hole ponds (Apr., July, Sept., Dec). Sangamon, Illiopolis 

 — Sangamon River (June, July). 



D. SERTULARIA var. PROTUBERANS (Lemm.) Krieg. Ahlstrom, loc. cit., 



p. 150. pi. 2. f. 17-25 (1937). 

 Dinobryon protuberans Lemm. 



Ahlstrom 1937, p. 150: Cook— Lake Michigan (Aug.). Kofoid 

 1908, p. 78, as D. protuberans: Mason, Havana — Illinois River. 



D. sociALE Ehr. Ahlstrom, loc. cit., pi. 3. f. 37-52 (1937). 



Ahlstrom 1937, p. 152: Cook — Lake Michigan (June-Aug.). 

 Lake, Diamond Lake — in Diamond Lake (June) ; Wauconda — 

 Bangs Lake (June). Kofoid 1908, p. 78: Mason, Havana— Illinois 

 River. 



D, SOCIALE var. americanum (Brunnth.) Bachm. Ahlstrom, loc. cit., 



p. 153. pi. 3. f. 30-36 (1937). 



Dinobryon stipitatum var. americanum Brunnth. 



Ahlstrom 1937, p. 153: Cook— Lake Michigan (May, June). 

 Kofoid 1908, p. 78, as D. s. var. americanum: Mason, Havana — 

 Illinois River. 



Order: RHIZOCHRYSIDALES 



Family: RHIZOCHRYSIDACEAE 



RHIZOCHRYSIS Pascher, 1913 



R. limnetica Smith. Smith, Bull. Wis. Geol. & Nat. Hist. Surv. 

 57(1): 77. pi. 14. f. 6 (1920). 



Eddy 1927B, p. 215: Cook, Chicago— Lake Michigan (July). 



