1898] THE DEVELOPMENT OF SOME ANTHRACNOSES 73 
and radiating in two to five directions. Upon this growth the 
first and most abundant development of conidia takes place, 
which gives it a flesh color; beyond this the growth is nearly 
uniform. The colony is almost colorless at first, later assuming 
a delicate flesh color with the pigment developed in connection 
with production of conidia. The conidia are formed acrogen- 
ously on the branches of the mycelium; as the successive ones 
are formed they push the older ones aside, where they may be 
seen lying in evenly arranged rows or piled up in little heaps. 
Becoming more numerously developed in some places, they 
form light pink acervuli quite evenly distributed over the colony. 
On bean stems the fungus develops a dense white or grayish 
mycelium, which extends over the stems and the surface of the 
infusion in a flocculent weft. About three days after transfer- 
ring, blackened fruiting sori make their appearance upon the 
stems ; from these issue the pink masses of conidia, varying in 
color under different conditions ; in parallel cultures the pigment 
had a deeper tint on infusion of apple than on bean stems. With 
age there is developed an abundant stroma, spreading over the 
stems and underlying the younger flocculent mycelium. The 
mycelium forming the stroma becomes coarse, irregular, and 
dark colored. 
In old plate cultures the protoplasm of the mycelium has 
been seen to break up into elliptical spore-like bodies arranged 
somewhat diagonally in the cells or placed end to end. The 
dark, club-shaped bodies may be lacking in the entire life cycle 
of this Species, but conidia sown in a hanging-drop of water ire 
quently send out a short promycelium upon which these bodies 
are borne the second or third day after germination. 
It has been observed that in old cultures on bean stems, 
especially in those that have been repeatedly transferred, the 
acervuli become less prominent, in fact scarcely make their 
appearance at all; but an abundant stroma is developed. This 
peculiarity corresponds apparently to the habit of the fungus on 
its natural host, for in the older pustules, in which the ends of 
the basidia have grown out in long, dark colored filaments, the 
