PLATE 26 
Helminthosporium leersii 
A.—Portion of plant of Leersia virginica attacked by H. leersii showing foliar spots in 
various stages of development and resultant withering of successively younger leaves. 
X I- Drawn from material collected near Meriden, Conn., September 7, 1920. 
Ba-1.—Conidiaof H. leersii produced on Leersia virginica under natural conditions, 
showing variations in size, shape, and septation. X500. 
C.—Portion of leaf of, Leersia virginica attacked by H. leersii, showing foliar '‘eye 
spot” in detail. X 3. 
Da-c.—Conidia from diseased leaf of Leersia virginica germinating by the production 
of two polar germ tubes. X500. 
E.—Ramifying system of short hyphal elements produced in lo-day old potato 
dextrose agar culture. Ea, h represent stolon-like elements, by the elongation of 
which the mycelium becomes more extensive. X500. 
Fa-b.—Conidiophores of H. leersii produced on leaf of Leersia virginica under natural 
conditions. X 500. 
