CLASSIFIED CATALOG OF ILLINOIS ALGAE 111 



T. QUADRATUM f. MINUS ACUTUM Reinsch. Brunnthaler, loc. ciL, p. 

 150 (1915). 



Collins 1909, p. 164. 

 T. REGULARE Kuetz. Tiffany, Contrib. Franz T. Stone Lab. 6: 64. 

 pi. 11. f. 231 (1934). 



Britton: Cook, Northbrook— ponds at Somme Forest Preserve, 



June 27, 1938, #113, May 8, 1939, #240; Schnells Corner— ponds 



at Elk Grove Forest Preserve, June 22, 1939, #324. 

 T. TRIGONUM (Naeg.) Hansg. Brunnthaler in Pascher, Suesswass.-fl. 

 Deutsch. 5(2): 149. f. 163 (1915). 

 Polyedrium trigonum Naeg. 



Kofoid 1908, p. 30, as Polyedrium trigonum: Mason, Havana — 



Illinois River (June-Oct.). Eddy 1931 B, p. 461 : Pulaski, Wetaug 



— sink-hole pond (July, Sept., Dec). 

 T. TRIGONUM f. MA JUS Brueg. Brunnthaler, loc. cit. (1915). 



Collins 1909, p. 162. 

 T. TRIGONUM var. MINUS Reinsch. Brunnthaler, loc. cit. (1915). 

 Polyedrium trigonum var. minus Reinsch 



Kofoid 1908, p. 30, as Polyedrium t. var. minus: Mason, Havana 



— Illinois River ("summer"). 

 T. TRIGONUM var. TETRAGONUM (Naeg.) Rab. Brunnthaler, loc. cit. 

 (1915). 



Polyedrium trigonum var. tetragonum (Naeg.) Rab. 



Kofoid 1908, p. 30, as Polyedrium t. var. tetragonum: Mason, 



Havana — Illinois River ("summer"). 



TREUBARIA Bernard, 1908 



T. CRASSISPINA G. M. Smith. Tiffany, Contrib. Franz T. Stone Lab. 

 6:65. pi. 11. f. 262 (1934). 



Eddy 1931B, p. 461: Pulaski, Wetaug— sink-hole pond (Sept., 



Dec). 



TROCHISCIA Kuetzing, 1845 



T. ARGUTA (Reinsch) Hansg. Brunnthaler in Pascher, Suesswass.-fl. 

 Deutsch. 5(2): 205 (1915). 



Collins 1909, p. 146. 

 T. RETICULARIS (Reinsch) Hansg. Tiffany, Contrib. Franz T. Stone 

 Lab. 6:54. pi. 9. f. 183 (1934). 



Collins 1909, p. 145; Transeau: Coles, Charleston— ditch (Apr.) 



Family: SCENEDESMACEAE 



ACTINASTRUM Lagerheim, 1882 



A. HANTZscHii Lag. Tiffany, loc. cit., p. 72. pi. 10. f. 226 (1934). 



Galtsoff 1924, pp. 399, 401, 402, 404, 405; Carroll— Mississippi 



