328 
Journal of Agricultural Research 
Vol. I, No. 4 
Fig. 6.—The anthracnose fungus upon corn-meal agar. 
X84; B , conidia, X400; C, ascus, X400. 
A, Acervulus, 
epidermis and becomes partially superficial. The mature fruiting body 
is nearly spherical, but is papillate and occasionally short beaked. From 
several hundred measurements it has been found to vary from 80 to 
250 p in the longest diameter, with the majority lying between 150 and 
200 fx. The perithecia 
are black and carbo¬ 
naceous, and in cul¬ 
ture several are usu¬ 
ally developed within 
a single carbonaceous 
stroma. 
The 8-spored asci 
vary considerably in 
size and shape, but are 
usually cylindrical- 
clavate. (Fig. 6.) The 
extreme measure¬ 
ments found were 45 to 80 by 9 to 12.5/1, the majority lying within the 
limits of 55 to 80 by 10 to 11 fi. 
The ascospores are unicellular (rarely with a cross partition), oblong, 
slightly tapering toward both ends, and usually curved. (Fig. 6.) The 
extreme measurements found were 12.5 to 
29 by 3.5 to 6 {i, the majority lying about 
midway between the two extremes as shown 
in the accompanying graph (fig. 7) drawn 
from measurements of 150 spores of a single 
strain taken at random and all developed 
in corn-meal-agar culture. Measurements of 
other strains both from culture and from the 
host have come within these limits. 
The acervuli have been of much more com¬ 
mon occurrence on the host. (Fig. 6.) In 
their early stages they are scarcely to be dis¬ 
tinguished from the perithecia, but the pro¬ 
duction of the characteristic pink spore 
masses soon differentiates them even macro- 
scopically from the perfect stage. The 
production of setae has been found of fre¬ 
quent though by no means of general occur¬ 
rence, and to vary even within a single strain. 
1 
4 j-tf 
AT/C&OM& 
Fig. 7. —Diagram showing ascospore 
measurements of the anthracnose 
fungus. A y Length of 150 ascos¬ 
pores; By width of 150 ascospores. 
The conidia are ovate to oblong, with blunt, rounded ends (fig. 6) 
(occasionally somewhat dumbbell-shaped). Both on the host and in 
culture they have been found to develop hyphomycetously, as well as 
in acervuli. The measurements taken from several strains on the host 
