PLATE XXXVIII 



Fig. I. — Infection through a lenticel of Burbank plum the cavity of which is lined 

 with corky-walled cells. The hyphse are incapable of dissolving the middle lamella 

 between these cells, but apparently exert enough pressure to split the epidermis 

 away from the underlying cells, thereby allowing the hyphae to enter the fruit tissue. 

 X 216. 



Fig. 2. — Left side of figure i in detail, showing hyphse entering the fruit tissue after 

 the epidermis has been raised by the growth of the hyphae in the stomatal cavity. 

 X 400. 



Fig. 3. — Infection through a lenticel in B X W4. The hyphffi swell on entering, 

 filling up the stomatal cavity. X 200. 



Fig. 4. — Infection through a stoma in a young green fruit of Prunus americana seed- 

 ing No. I, in which no corky walls have yet been formed. X 400. 



Fig. 5. — Infection through a lenticel of the same type as is shown in figures i and 3. 

 The hyphse have filled the stomatal cavity and are raising the epidermis from the 

 underlying cells. The hyphse can enter the fruit tissue through the split thus formed. 

 X 200. 



Fig. 6. — Half-grown fruits of B X Wis completely rotted through wound inocu- 

 lations. Only very few spore tufts are being produced. This is a resistant variety. 



Fig. 7. — Half -grown fruits of B X W2r completely rotted through wound inocu- 

 lations. This variety is intermediate in degree of resistance. 



Fig. 8. — Half-grown fruits of A X W15 completely rotted through wound inocu- 

 lations. This variety is intermediate in degree of resistance. 



Fig. 9. — Half-grown fruits of Etopa plum completely rotted through wound inoc- 

 ulations. The plums are completely covered with large spore tufts. This is a very 

 susceptible variety. 



