1898 ] THE DEVELOPMENT OF SOME ANTHRACNOSES 99 
In germination the protoplasm pushes out through one or 
more germ tubes usually near the end of the spore, in the usual 
manner. The colony, as it first appears to the unaided eye, 
presents a somewhat stellate appearance, but later from the point 
of inoculation a nearly uniform appearance is presented over a 
larger part of the colony, with a delicately fringed margin of 
spreading mycelium. The mycelium which grows both above 
and below the surface of the agar is at first nearly colorless; 
with age it becomes a dark smoky color. The discoloration 
usually appearing some distance from the point of inoculation, 
extends outward in irregular radiations. The ends of the threads 
become enlarged, colored, and delimited by a septum. These 
enlargements are also intercalary and at times peculiarly lobed 
and branched. At the center of the colony are grouped the 
dark colored fruiting bodies. At these points a stroma is formed 
and from some cells of the stroma setz are borne as in nature. 
On bean stems the fungus produces a grayish mycelium which 
spreads over the surface of the infusion, becoming in time of a 
dark smoky color. A thin stroma spreads over the stems, and 
acervuli are produced abundantly, and are at times confluent. 
The sete, which are quite conspicuous, are borne usually on the 
Margin, sometimes at the center of the pustule. 
ASCIGEROUS FORMS. 
The course of development of many of the Ascomycetes, 
especially the Pyrenomycetes, is pleomorphic, and various con- 
idial forms have been definitely interpolated with ascigerous 
Stages. The structure and habits of the species of Glaeospor- 
ium and Colletotrichum suggest that they too are form genera, 
having biological relations with perfect forms, although little 
has been definitely proven in this group to establish the con- 
nection,. 
Since the mycelial growth takes place largely near the sur- 
face of the host, and the conidia, provided with delicate walls, 
require no resting period previous to germination, evidence 1S 
strong that in the course of their life history, or at least in some 
