CLASSIFIED CATALOG OF ILLINOIS ALGAE 23 



Richards, June 18, 1940. Forbes & Richardson 1913, p. 535: 

 Peoria, Chillicothe — Illinois River (Sept., Oct.). 



O. TENUIS Ag. ex Gom. Geitler, loc. cit., p. 959. f. 611f-g (1932). 



Including material collected by E. N. Transeau and placed in the 



Herbarium of the New York Botanical Garden (#927) as 0. formosa 



Bory {Me Dr. F. Drouet). 



Solheim & Penfound 1928, p. 86: Champaign, Urbana — small 

 stream N. of (Feb.-June). Transeau; Drouet, Field Mus. : Coles, 

 Charleston — small stream (Sept.); Mattoon — swamp N. of 

 (Apr.). Drouet, Field Mus.: Lake, Waukegan — ^pond near the 

 railroad station at Dunes Park, coll. by F. Drouet, P. C. Stand- 

 ley and J. A. Steyermark, June 14, 1940. 



O. TENUIS var. natans Gom. DeToni, Sylloge Algarum 5 : 168 (1907) ; 



Geitler, loc. cit., p. 959 (1932). 

 Oscillaria natans Kuetz. 



Johnson & Atwell 1890, p. 21, as Oscillaria natans: Cook, Evans- 

 ton (?) — prairie ditches (Mar.). 



PHORMIDIUM Kuetzing, 1843 



P. AMBiGUUM Gom. Geitler, loc. cit., p. 1015. f. 647e (1932). 



Transeau 1913B, p. 71: Coles, Ashmore — from shell of a live 

 snapping-turtle in stream S. of (May). 



P. AUTUMNALE (Ag.) Gom. Geitler, loc. cit., p. 1026. f. 652k-l, 653a 



(1932); DeToni, Sylloge Algarum 5: 252 (1907). 

 Oscillaria antliaria Juerg. 



Transeau: Coles, Charleston — (Jan.). Johnson 8c Atwell 1890, p. 

 21, as Oscillaria antliaria: Cook, Bowmanville — (July). Drouet, 

 Field Mus.: La Salle, Starved Rock State Park — in water run- 

 ning from Salt Well, coll. by D. Richards, P. D. Voth and D. T. 

 Ries, Mar. 22, 1940. 



P. FAVOSUM (Bory) Gom. Geitler, loc. cit., p. 1024. f. 652a-b (1932). 

 Drouet, Field Mus.: Dupage, Black Partridge Woods — in a 

 spring, coll. by P. C. Standley, J. A. Steyermark and F. Drouet, 

 Oct. 18, 1938. 



P. FOVEOLARUM Gom. Geitler, loc. cit., p. 999. f. 636c-d (1932). 



Transeau 1913B, p. 71, as P. foveolatum: Coles, Charleston — on 

 submerged water plants in lily pond (Sept.). 



P. INCRUSTATUM var. CATARACTARUM (Nacg.) Gom. Geitler in 



Pascher, Suesswass.-fl. Deutsch. 12: 386. f. 490 (1925). • 



Field Mus. : St. Clair, Falling Spring— forming a firm calcareous 

 coating on wet rocks, coll. by F. S. Collins, P. B.-A., Mar. 29, 

 1918. 



