170 Barker . — The Morphology and Development of 
conidia and kept at 27 0 C, germination soon takes place by 
the putting out of one or more germ-tubes by a conidium, 
which at the same time increases slightly in size. The 
germ-tubes grow rapidly, transverse septa soon appear, and 
numerous branches are produced (see Fig. 1). In this way 
a vigorous and abundant mycelium is quickly formed. While 
the system of branching apparently does not follow any de- 
finite rule, it nevertheless often happens that the formation 
of a branch from one side of a hypha is responded to by the 
formation of another on the opposite side of the hypha, so 
that an arrangement of the branches in pairs is met with 
(see Fig. i,e). Another point to be noticed is that there 
is a considerable tendency on the part of the hyphae to swell 
at various points (see Fig. i,e). In a few cases the hanging 
drop almost dried up at the time of germination. In such 
instances the germinating conidia and hyphae swelled enor- 
mously, the subsequent branches only regaining the normal 
size when the drop again became more moist. 
After about twenty-four hours, the time, however, depending 
apparently principally upon the amount of mycelium present 
in proportion to the size of the drop, conidia begin to be 
formed. These are produced by the swelling of the tips of 
hyphae into spherical or ovoid bodies, which are then cut off 
by transverse septa. Chains of these conidia are usually 
produced by the swelling of the hypha immediately under 
the terminal conidium, the swollen part being then cut 
off by a transverse septum to form a second conidium, and 
the same process being then repeated time after time 
immediately below the conidium last formed. Such chains 
may be found, composed of as many as eight to ten conidia, 
although usually the number is considerably less. 
The conidia are developed very rapidly at first, but the 
rate of formation gradually becomes slower until very few 
fresh ones are formed. It is at about this time that the 
development of the ascocarps begins, being about twenty-four 
hours after the formation of the first conidia. 
The older hyphae are then filled with large vacuoles, and 
