100 A CATALOG OF ILLINOIS ALGAE 



Evanston- — aquarium (Mar.), small pond in Calvary Cemetery, 

 June 23, 1938, #74, city water reservoir, June 27, 1938, #106; 

 Morton Grove^ — small pond about 1 mile N.W., Oct. 3, 1938, 

 #217, 218; Northbrook — small pond on Pfingsten Road about 1^ 

 miles S. of Techny Road, May 12, 1938, #64, small ponds in 

 Somme Forest Preserve, May 15, June 23, 1938, #65, 67, 115; 

 Sag Bridge — old quarry pond, Sept. 8, 1939, #1007, small ponds 

 and swamp, Sept. 8, 1939, #1015, 1021; Schnells Corner — pond 

 in Elk Grove Forest Preserve, Aug. 8, 1939, #780. Douglas, 

 Arthur — pond (May). Lake, Antioch^ — channel between Grass 

 Lake and Lake Marie, Lake Marie, and Channel Lake, Sept. 14, 

 1939, #1028, 1029, 1032, 1035; Fox Lake— Fox and Nippersink 

 Lakes, July 25, 1939, #594, 599, 602, 604, Aug. 25, 1939, #951, 

 • 953; Highwood— small pond. May 15, 1938, #73; Klondike- 

 Grass Lake, Fox Lake, Petite Lake, and connecting channels, 

 Aug. 25, 1939, #942, 945, 948, 958, 969, 971; Lake Zurich— in 

 Lake Zurich, Aug. 24, 1939, #913, 915; Libertyville— DesPlaines 

 River at Route 59A, July 29, 1938, #181. Volo— Fish Lake, Aug. 

 24, 1939, #935; Wauconda— Bangs and Slocum Lakes, Aug. 24, 

 1939, #920, 925-927; Waukegan— Dead River in Dunes Park, 

 May 11, 1939, #255, ditch, July 29, 1938, #173. Mason, Havana- 

 — Illinois River (all months). McHenry, Greenwood — Nipper- 

 sink Creek at Thayer School and below Wonder Lake Dam, 

 July 6, 7, 1939, #366, 432; McHenry— swamp on N.E. side of 

 McCullom Lake, July 6, 1939, #380; Richmond— Twin Lakes 

 (S. end of Lake Elizabeth), Aug. 2, 1939, #725, 729; Woodstock 

 —swamp about 2 miles S.W., July 7, 1939, #402, 403. St. Clair- 

 Mississippi River. Will, Lockport — Chicago Drainage Canal and 

 DesPlaines River (June-Oct.). 



P. BORYANUM var. LONGICORNE Racib. Tiffany, loc. cit., f. 148 (1934). 

 Britton: Cook, Northbrook — small pond in Somme Forest Pre- 

 serve, May 15, 1938, #67. 



P. DUPLEX Meyen. Tiffany, loc. cit., p. 50. f. 140 (1934); DeToni, 



Sylloge Algarum 1(2): 578 (1889). 

 Pediastrum pertusiim Kuetz. 



Jelliffe 1893, p. 311, as P. pertusum (Cook). Kofoid 1908, pp. 

 26-28, 32, 292, 315, as P. pertusum (Mason). Collins 1909, p. 

 179; Transeau 1913B, p. 81 (Coles, Montgomery, Moultrie). 

 Galtsoff 1924, pp. 399, 401, 402, 404, 405, 410 (Carroll, Hancock, 

 Henderson, Jo Daviess, Mercer, Rock Island, Whiteside). Eddy 

 1927A, p. 128 (Champaign). Purdy 1930, p. 72, as P. pertusum 

 (Will). Eddy 1931A, pp. 480, 483, 486 (Cass, Macon, Menard, 

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

 392, 394, 395, 399-403 (Adams, Alexander, Champaign, Cal- 



