IOWA ACADEMY OF SCIENCES, 233 



Pammel; Herb. C. R. Ball, Ames, F. C. Stewart; Crypt. 

 Dist. Iowa State College (16) Ames, A. F. Sample; (15) 

 Ames, A. F. Sample. 



The spores are at first enclosed in a whitish gelatinous 

 membrane. This is eventually ruptured and the spores 

 escape. It is found in Iowa wherever corn is grown and 

 annually occasions losses amounting to thousands of 

 dollars. 



At first I thought that the fungus on Enchlena might be 

 different but on careful examination concluded that so far 

 as morphological differences were concerned, that it was 

 Ustilago zece. The synonymy as given above has been 

 adopted directly from Magnus, though most of it has been 

 personally verified. 



Ustilago Arthurii N. Sp. 



Host. — Panicularia americana, (Torr.) MacM. 

 Specimens from lowa.^-Types in Ex. Herb. J. C. Arthur 

 were collected at Spirit Lake, Iowa, July 5, 1899, by Dr. J. 

 C. Arthur. 



Dr. Arthur's note made presumably at the time of col- 

 lection was, "Affected plants have the heads totally 

 destroyed." 



Cinfractia Cornu. Ann. Sci. Nat. Bot. 6:15. 277-279., 

 1883. 



Cintradia sorghi (Sorok.) De Toni. 

 Host. — AndropogoH Sorghum. 

 Specimens from Iowa. — Herb. Iowa State College (74) 

 Ames, H. Harold Hume and Otto Evers. 



All the ovaries of the affected plants were filled with 

 spores and a sharp, central columella was present. The 

 flowers were too old to make out the spore masses in the 

 stamens. 



Cintractia Jiinci (Schw.) Trel. 

 Host. — Juncus tetitiis. 

 Specimens from Iowa. — Herb. Iowa State College (131) 

 & (132) Ames, C. E. Bessey; (183) Ames, Hitchcock. 

 Cintractia sphceroqena (Burrill.) 

 Host. — Panicuni crus-galli. 



16 I AS 



