146 
that its rapid spread is certain, and in consequence the continuity 
of existence of the fungus is ensured. 
I have received much assistance in the preparation of cultures 
and slides from Miss M. N. Owen, Temporary Technical Assistant 
in the laboratory, and I am glad of this opportunity to record 
my indebtedness to her. 
EXPLANATION OF PLATE vy. 
The figures were drawn with the aid of a Zeiss camera lucida. 
A Swift } objective N.A. 0-62 and a III eyepiece were used for 
gur j 
Figs. 1—6.—Normal conidia of a strain of Botrytis from 
Primula leaves germinating directly to form microconidia. 
type noted in 6 
Fig. 8.—The extreme tip of one of the filaments arising 
conidiophore. The terminal cell is swollen and gives rise to 
sterigmata. Within the filament is a sterigma which is produc- 
ing microconidia forming a single chain along the lumen. Below 
these are seen two cells with irregularly thickened walls, which 
function as chlamydospores. . 
1g. 9.—A rejuvenated cell which has protruded through the 
pore in the transverse wall and formed a single sterigma produc- 
ing spores, within the filament. a and b show the development 
in a of eleven hours. 
Fig. 10.—A more complicated and usual case of the formation 
seen in 9 
Seacrest NT 
