PI.ATE 30 
Helminthosporium oryzae 
A. —Panicle of rice attacked by H. oryzae, showing some spikelets partly covered 
with dark growth composed of fructifications of the fungus. X i. 
B. —Leaf of rice showing numerous discolored spots resulting from inoculation with 
H. oryzae. X 
Ca-m.—Conidia of H. oryzae produced on diseased floral parts. Ca-b, very large 
spores from well developed mats of fructification; Cc,f, h, j, I, m, conidia more typical 
in size from scattered fructifications; Cd, e, conidia germinating typically by the 
production of two polar germ tubes; Ci, k, relatively immature conidia germinating 
atypically by production of lateral germ tubes from intermediate segments in addition 
to polar germ tubes. X 500. 
D.—Conidiophores of H. oryzae from infected floral scale showing origin from stout 
prostrate hyphae. X 500. 
