Leaf Curl and Plum Pockets. 331 



be modified so as to include the specimens with closely crowded 

 asci. It is possible in specimens where the hymenium has not 

 become evenly distributed over the surface that a section would 

 show some asci which were considerably separated. But not 

 taking this character into consideration I should consider it a dis- 

 tinct species from E. pruni. In 18S9 I found a small quantity of 

 this species in South Carolina, at Columbia. During the years 

 1890-93 I observed it as very common in Alabama, at Auburn. 

 Quite large trees would have nearly all the fruit destroyed each 

 year by it. 



The asci are cylindrical and rounded or truncate at the free 

 ends. They measure 20-33 long by 8-12 in diameter. The 

 stalk cells are 12-20 high by 8-12 in diameter, averaging about 

 one-third the length of the entire fruit body. These measure- 

 ments give a greater diameter than that given by Sadebeck, 8-9 

 being the diameter given by him for the asci and stalk cells. 

 The stalk cells frequently taper somewhat below and intrude 

 themselves slightly between the cells of the epidermis at times. 

 The mycelium I have not found to be so abundant in the tissues 

 as is the case with E. pruni on P. domestica. The spores are 

 more constantly rounded in form being approximately spherical, 

 and are 3-4 in diameter. See figures 34-36. 



Exoascus varius n. sp. 



The leaves of Prunus serotiyia are frequently affected with a 

 species of Exoascus which produces a folding or arching of the 

 leaf. During the years 1890-3 I observed this to be very com- 

 mon and injurious on many trees in Alabama. In fact the same 

 trees which were affected with the E. farlowii on the fruit had 

 their leaves also badly affected. The shoots also were much 

 deformed and sometimes enlarged, but there w^as not observed 

 any tendency to the formation of " witches' brooms." Nor were 

 any of the twigs observed to bear the asci. The deformity of the 

 twigs or shoots occurred at the ends of the leafy branches, the 

 leaves of the same being also diseased. Figures 13 and 14 are 

 from photographs taken from living specimens. The deformity 

 of the leaves and ends of the branches can be well seen. It is 

 quite remarkable that the fruit of the same branches is also 



