PLATE 12 
Helminthosporium siccans 
A. —Portion of plant of Lolium multiflorum attacked by Helminthosporium siccans, 
the upper leaf Aa showing relatively few discolored spots, the next leaf Ah showing 
a greater number, and the third, which has begun to wither at the tip, showing a 
large number of spots. X i • 
B. —Portion of diseased leaf, showing spots somewhat magnified. X 4. 
Ca-m.—Conidia from leaf of Lolium multiflorum, showing variation in size, shape, 
and abundance of septation. X 500. 
Da-b.—Conidia from leaf of Lolium multiflorum that have germinated by the pro¬ 
duction of a short sporophoric process on which has been produced a single secondary 
conidium. X 500. 
Ea-c.—Conidia from leaf of Lolium multiflorum germinating in water by the pro¬ 
duction of germ tubes from both end and intermediate segments. X 500. 
Fa-j.—Conidiophores from leaf of Lolium multiflorum, showing variation in size, 
and mode of emergence from stoma or more abundantly from between epidermal 
cells on vascular ridges. X 500. 
