PLATE 2 
Helminthosporium teres 
A. —Young volunteer barley plant showing heavy infection of net blotch as found 
occurring near Madison, Wis., during the earlier part of September, 1919. Youngest 
leaf (Aa) healthy: second and third leaves (Ab, Ac) showing increasing amount of 
infection; fourth leaf {Ad) beginning to wither at the tip; fifth leaf {Ae) entirely 
withered. XK- 
B. —Portion of diseased leaf showing discoloration in characteristic irregular reti¬ 
culate pattern. X3. 
Ca-f.—Conidia from diseased barley leaf showing variation in size, shape, and 
septation. X.Soo. 
Da-d.—Conidia from diseased barley leaf germinating in tap water, showing pro¬ 
liferation of germ tubes from end and middle segments. X500. 
Ea-d.—Conidiophores emerging from stoma in group of 3, and singly from between 
adjacent epidermal cells. X500. 
