282 



MANUAL OF POISONOUS PLANTS 



Fig. 101. Spores of Yellow Leaf Disease of Barley (Helminthosporium gramineum'). 

 a. and e. Spores germinating, d. Conidiophore. 2. Leaf browning of Corn (Helmin- 

 thosporum turcicum). Spore and conidiophore to the left. To the right, conidiophore 

 pushing through stoma. 



Distribution and hosts. On corn, widely distributed in North America. 

 Poisonous properties. All of these fungi may be regarded as injurious, 

 possibly producing stomatitis. 



Scolecotrichum graminis, Fuckel 



Elongated brown or purplish-brown spots, the centers of which are gray 

 or whitish and contain minute black dots; these small dark spots contain the 

 tufts of brown fungus threads, which make their way out through the stomata; 

 the hyphae are somtimes septate and the spores are usually borne at the end 

 or occasionally in a lateral position; these fruiting hyphae bear small, smoky- 

 brown, two-celled spores; the cells of the leaf become much altered, because 

 the colorless threads of the fungus permeate them. On barley the disease is 

 marked by brown or purplish-brown spots which appear on the leaf transversely. 



Distribution. Widely distributed in Europe and North America. 



Poisonous properties. May possibly produce mycotic stomatitis. 



