PLATE XXXIX 
Fig. i.—A rotting area in an overripe fruit of S. D. No. 3. In the healthy portion 
at the right the middle lamella is still intact, while in the rotted portion the cells are 
free. This is a resistant variety. X 216. 
Fig. 2.—Tip of hypha in Opata plum. The middle lamella is being split slightly 
ahead of the hyphse. This is apparently not due to mechanical pressure, as the walls 
in contact with it are collapsed. X 200. 
Fig. 3.—The edge of a rotting spot in a green fruit of Opata plum. The middle 
lamella is dissolved in advance of the penetration of the hypha. This is a susceptible 
variety. X 216. 
Fig. 4.—Tissue of apple infected with PenicilMum expansum. A short piece of 
hyphse may be seen in the center of the figure. The middle lamella is completely 
dissolved. X 156. 
Fig. 5.—Cross sections of hyphse in tissue of Opata plum 18 hours after inoculation. 
The dark areas are collapsing cell walls. The hyphse are entirely intercellular. X 400. 
Fig. 6.—Portion of the rotted area of an Opata plum 18 hours after inoculation. 
Although only few hyphse are present, the middle lamella is completely dissolved. 
X 200. 
