134 
protoplasm which by virtue of its sporogenating function is in a 
vigorous and plastic condition. : 
en microconidial formation occurs the spore-bearing branch- 
e ise to lon 
slender hyphae which either terminate in slightly swollen cells. 
from which arise the sterigmata (Pl. v. fig. 8), or more rarely 
pass directly into a single sterigma. Not infrequently these 
hyphae are themselves branched, so that a freely ramifying 
system is formed, producing an immense number of spores. 
ee or branched sterigmata often arise laterally on these 
requently the sporogenous branches of the conidiophore do: 
not proliferate, but slender hyphae develop from immediately 
below them, and these originate the microconidia as already 
described. 
Microconidial formation may occur in one of two ways. 
figs. 9 an ). Not infrequently several old cells are traversed 
by the sporogenating hypha before the principal formation of 
urs, and often the containing cells are ultimately so 
‘ | E . j h on germ 
tion give rise to microconidia. Often this contraction does not 
occur, but in all cases there is an apparent renewal of vigour 
and a marked increase in the quantity of cell content. 
et pnaearising from 
of the vegetative mycelii 3 
either di . ycehum may give rise to sterigmata borne 
e mycelium of various species 
