1894. ] Cultures of Isaria farinosa. 131 
slices of potato the larger part of which is exposed, partly 
dry and not in close contact with the sides of the tube, the fungus 
spreads quickly, and extends more slowly through the sub- 
stance of the potato to the surface which is in closer contact 
with the culture tube, and which is quite moist from the ex- 
cess of water on the bottom and the side of the tube to which 
it gravitates as the tube is kept in an oblique position. As 
the watery infusion gradually disappears by slow evaporation 
and by being absorbed by the growth of the fungus, the 
threads appear on the other side of the potato. Now since 
there is a less content of water and the substance has lost 
some of its richness, the fungus does not grow so profusely 
hor so rapidly. There is then a tendency to grow into sporo- 
phores composed of numerous parallel threads which arise 
tom the surface of the substratum in the same manner as the 
hormal sporo 
the pupa of the insect. The large majority of these sporo- 
phores on potato are much shorter than those on the insect, 
rae stouter, the diameter being two to 
our times that of the sterile portion of the sporophore as it 
From ten to forty of these sporophores 
rdinary sized piece of potato in a culture 
of an orange buff, or buff yellow color. 
e from 2-4™" high, while still others are 
y may be divided at the free extremity into 
In one culture a very large sporophore was 
May arise from an o 
tube and they are 
6-10", and the 
Perpendicular to t 
Perpendicular to ¢ 
long it ca 
this growth th 
ance characterist 
tek it Was obs 
taba lengt 
length eh nos inthe tube. This continued until the entire 
ts hat SPorophore was 3. At various places it ap- 
: ait and send out a thin membranous expanded 
