204 



GRASSES OP IOWA, 



attention as I have given it, yet it is not without a reason that 

 I have made so much of it, as will soon be seen. Moreover, I 

 found the wheat in nearly all well attested cases of 'Take-all' 

 to be infested with two fungi, namely, Cladosporium herbarvm 

 and Septoria graminum. Both these fungi have long been known 



Fig. 94. (a) Septoria hromi on Bromus eecalinus, small black spots on leaf the perl- 

 theoia. 



Fig. 95. Spores of Septoria hromi. 



