GRASSES OF IOWA. 



211 



Fig. 99. Yellow leaf diseae of barley ( Helmintfios- 

 porium graminum, Eabb. ) a.hypha; b, hypha arising 

 from short cells; c, conidiunn, cluster of conidiophores 

 to the left; d, mycelium. (Pammel and King.) 



Fig. 100. Helminthosporiiun grhminum; a, spore germinating ; d, conidiophore; b, 

 conidlophore; e, conidium or spore. 



Fig. 101. Leaf browning of corn (Hclmi7ithosporium tiircicum) to the right. Myce- 

 lium below and a seven-celled spore above. Condiophore pushing through the stoma 

 in right-hand figure. (Pammel and King.) 



