PLATE 15 
Helminthosporium vagans 
A.— Poa praiensis with leaves abundantly spotted as result of numerous local infec¬ 
tion by H. vagans. Drawn from material collected in Brooklyn, N. Y., 
August, 1920. 
Ba-q.—Conidia produced on leaf of Poa pratensis, showing variation in size, shape, 
and septation. X500. 
Ca, b.—Conidia produced on leaf of Poa pratensis, germinating in water by pro¬ 
duction of germ tubes indiscriminately from end and middle segments. X500. 
Da-g.^—Conidiophores of H. vagans, showing variation in dimension, shape, and 
septation; emergence singly or in pairs from stomata or between epidermal cells; and 
occasional irregular branching characteristic of the species. X500. 
