PLATE 25 
Helminthosporium turcicum 
A.—Outline of conidium of H. turcicum, showing attachment to conidiophore. 
X 500. From material grown in 20-day old tap-water agar culture. 
Ba-Bg.—Conidia of H. turcicum developed in pure culture on tap-water agar. X 500. 
Bh-i.—Conidiophores from 20-day old tap-water agar culture, showing relation 
to mycelium. X 500. 
C.—Outline of conidium from diseased corn leaf, showing relation of hilum to basal 
segment. X 500. 
Da-d.—Conidia germinating in water, either typically {Dh, c) by the production 
of two polar germ tubes; or atypically {Da, d) by the proliferation of a lateral germ 
tube in addition to one or two polar tubes. X500. 
