PLATE 5 
Helminthosporium tritici-repentis 
A.—Small plant of Agropyron repens, as found near Brooklyn, N. Y., July 12, 1920, 
showing four lower leaves withered and killed as result of attack of fungus; discolora¬ 
tion absent but microscopical examination revealing abundance of fructifications of 
H. tritici-repentis on three lowermost leaves. X K- 
Ba-m.—Conidia showing variation in size, shape, dimensions, and abundance of 
septation and the distinctive contour of the basal segment characteristic of the species. 
X 500- 
C.—Conidium germinating normally in water mount by proliferation of germ tubes 
indiscriminately from nearly all segments. X 500. 
Da-f.—Conidiophores showing mode of emergence from stomata and from between 
adjacent epidermal cells. X 500. 
