rOEDO SEOETUM, OH SMUT. 



05 



It reduces the ears both of wheat and barley 

 to tlie condition figured in the drawings, and 

 has the same effect upon oats. The black 

 masses of sooty powder are the spores of the 

 fungus which are here delineated, magnified 

 375 diameters. 



Spores of uredo srgttion in wheat, 

 magnified 375 diameters. 



Spores of uredo segdum in barley 

 magnified Zib diameters. 



The specimens from which these drawings 

 are made, were gathered by the author in the 

 summer of 1845. The ears were, in both cases, 

 completely ruined. Some farmers say they like 

 to see a little of it, because it is always accom- 

 panied by a good crop. Certainly, as pro- 

 fessor Ilenslow well observes, the "little" can 

 only be, with any propriety, on the principle of 

 the less the better. Undoubtedly every ear 

 attacked is destroyed, as is evident from the 

 first instant it emerges from its hose, or sheath. 

 The extreme smallness of the spores of this 

 fungus may be inferred from the drawings, 

 c 



