232 IOWA ACADEMY OF SCIENCES. 



other is. Still there may be biological differences, or the 

 two may be distinct, though the writer does not think so. 

 Ustilago Trifici, (Persoon) Jensen. 

 Host. — Ty'dicum iidgare. 



Specimens from Iowa. — Herb. Iowa State College (91 

 Ames, F. C. Stewart; (92) Ames, C. B. Weaver; (144) Coun- 

 cil Bluffs, L. H. Pammel. Crypt. Dist. Iowa State College 

 (0), Ames, CI. W. Carver. Herb. C. K. Ball, Ames, F. C. 

 Stewart. 



Ustilago ufricalosa (Nees) Fries (Nees) Tul. 

 WoBt.-— Polygonum lapafhifoliuui, var. incarnatum. 

 Wats., P. FennsglvaniciiHi, L., P. hgdropiper. 



Specimens from Iowa. — Herb. Iowa State College (93) 

 Greenfield, F. C. Stewart. (95 and 96) Ames, C. E. Bessey. 



Ex. Herb. J. C. Arthur 3 (1737) Charles City, J. C. Arthur; 

 Decorah, E. W. D. Hoi way. 



Herb. C. R. Ball, Ames, C. K. Ball. 



Herb. Hume, (18 & 8) Ames, H. Harold Hume. 



Crypt. Dist. Iowa State College (30) Ames, A. F. Sample. 



Every flower in the head is usually destroyed and much 

 swollen. One specimen in Professor Arthur's herbarium, 

 on P. hydropiper, collected at Charles City, showed spores 

 lighter in color and with somewhat smaller reticulations 

 than usual. 



It is altogether probable that the species now know as 

 Sphacelofheca Htjdropiperis (Schum.) DeBary was at one 

 time confused with this species. The figure given by Nees, 

 both in Das. Syst. der Pilze and Schw. does not resemble 

 the cut given by Corda, nor does it look like utriculosa as 

 we know it. Corda's illustration is good for this species 

 but not of those given by Nees, (1817 and 1834) are quite 

 like Sphacelotheca hydropoperis (Schum.) DeBary. 

 Ustilago Zece (Beckm.) Ung. 

 Host. — Zea Mays. Euchlena luxurians. 



Specimens from Iowa. — Herb. Iowa State College (25) 

 Ames, F. C. Stewart; (28) (29) (30) (31) (32) L. H. Pammel; 

 (83) G. P. Miller; (34) C. E. Bessey, Emmet Co.; Ex. Herb. 

 Hume (13) Ames, H. Harold Hume; (67) Boone, L. H. 



