joa] THE PARASITISM OF BOTRYTIS CINEREA 423 
characteristic effect of Botrytis filaments upon vegetable tissue, 
asseen under the microscope. Here is represented a filament 
of Botrytis growing in the petiole of a lettuce leaf, a soft, succu- 
ittissue. The effect is seen to be a darkening in color, loss 
ay disintegration of protoplasm, a — of the 
Fe llapse, the bccn being 
ently remote from 
ents. The same effect is 
; as this i is not in a strict 
That is, it does 
