IOWA ACADEMY OF SCIENCES. 227 



Spore masses in the ovaries of Setaria (jlaiica; spores 

 'brown tinged with yellow; spores minutely and sparsely 

 echinulate. U. panici-glauci. 



Mycelium perennial ; spore masses in the ovaries, 

 brownish black spores smooth. U. perennans. 



Spore masses in the ovaries, distended, swollen, spores 

 minutely spiny. U. pustulata. 



Spore masses in the unopened inflorescence of Panicuin 

 sa/if/iiiiKiic and P. (jlaucion ; spores 8-15 u; minutely echin- 

 ulate. [T. Rabenhorstiana. 



Spore masses in the ovaries of Erdyrosfis iiKfJor, spores 

 densely echinulate. U. spermophora. 



Spore masses in the unopened inflorescence of Panicnm 

 eaalllare, P. [iroliferuDi and r'. frihuloides; blackish, spores 

 minutely echinulate. U. syntherismae. 



Spore masses in the ovaries, of Triticmn vuhjare; spores 

 echinulate. U. tritici. 



Spore masses in the ovaries brownish violet, spores 

 violet, widely and deeply reticulated. U. utriculosa. 



Spore masses on leaves, flowers, stems, or roots; spores 

 very variable in shape, echinulate. U. zese. 



Spore masses completely destroying the panicle; spores 

 12-18u, densely and coarsely tuberculate. U. Arthurii. 



Ustilago Austro-americana, Speg. 



Usfilago Austro-a}iieriai)i(( Speg. Fungi argentini 4: 

 19. 



Exsiccati.— Ell. and Ev. N. A. F., 2262. 

 Sey. and Ear. Ec. F. 372. 



Spore masses in the inflorescence, brownish black, hard, 

 irregular in size and shape; spores globose or slightly ellip- 

 tical; light brown; 10-15x8 9u; epispore distinct, bearing 

 minute spines. 



Host. — Pohjqonum incaniatiiDi Ell. 



Specimens from Iowa. — Ex. Herb. J. C. Arthur (1787), 

 Ames; C. E. Bessey; Herb. Hume (14) Ames, H. Harold 

 Hume, 



Thesporesare bound together in hard, compact, irregular, 



