PLATE 31 
Helminthosporium oryzae 
Aa-b.—Subhyaline conidia of H. oryzae from tap-water agar culture, 30 days old. 
X 500- 
B.—Conidiophore from tap-water agar culture, 30 days old, showing relation to 
vegetative mycelium. X 500. 
Ca-e.—Conidia from potato-dextrose agar culture, 30 days old; Ca, conidium germ¬ 
inating typically by production of two polar germ tubes; Cb, e, Conidia showing 
subhyaline end and intermediate segments; Cc, Conidium with two subhyaline end 
cells; Cd, Conidium of uniform color without subhyaline segments. X 500. 
D.—Fructification and denuded conidiophores developed on potato dextrose agar, 
30 days after inoculation, showing relation of sporophores to vegetative hyphae, angle 
at which conidia are attached, and variation of the latter in shape, size, and septation. 
X 500- 
