216 



GRASSES OP IOWA. 



tion of rye is total in some places, the fungus investing the 

 whole kernel. Rostrup* mentions it as destructive to ger- 

 minating barley. It also occurs upon ergotized rye and is 

 regarded by some mycologists as distinct from Fusarium cul- 

 morum. It is probable that the various species of Fusarium 



^^^^ 



V 



Pig. 103. Wheat scab (Fusarium roseum or, Oibherella smibinettii (Mont.t Sacc). !• 

 wheat head affected with wiieat scab, upper portion destroyed; 2, spores of Fusarium; 

 •3,glumes covered with perithecia; J.perithecia;";, ascl from perithecia,with ascospores, 

 one of these enlarged at 6; 7, conldlophore and conldia grown in agar, i After Seiby, 

 Ohio Agrl. Exp. Sta.). 



infesting cereals should be referred to F. roseum, Link, f and 

 according to SaccardoJ, the ascigerous stage is Gibberella sau- 

 6meiiM (Mont.) Sacc. Selby§ agrees with Saccardo in regard 

 to its genetic connection with Gibberella. 



*I. 538. 



tFrank. Krankhelten der Pflanzen 358. (Ed. 2.) 1896. 



*3yll. Fung. 2: 554. 



§Bull. Ohio Agrl. Exp. Sta. 97: 40. 



