118 
Fic. 15.—Diagrams elucidating conidial shape. 
longitudinal axis of the conidium. In diagrams I and II, Fig. 15, the 
point of greatest diameter on the line a—a’ is midway between the base 
and apex of the conidium; while in diagrams III and IV it is nearer to its 
base. If the conidium tapers from the point of greatest thickness toward 
each end a fusiform (Diagr. III) or elliptical (Diagr. I, 1, 2) conidium re- 
sults. If for a sufficient distance on each side of the line a—a’ the conidium 
remains of uniform diameter it approaches more nearly the form of a cyl- 
inder (Diagr. II, 1, 2}. When the maximum diameter is nearer to the base 
than to the apex, somewhat rapid tapering gives a fusiform conidium ( Diagr. 
III), but if (asin Diagr. IV) the diameter lessens very gradually, as from the 
point a to point y, the conidium may be said to be subcylindrical. 
