376 
become black and crisp, and the bases of the larger leaves which 
bore the asci also become blackened. This also extends into the 
ends of the affected shoots. 
EXOASCUS DECIPIENS SUPERFICIALIS N. var. 
The half developed fruits of Prunus Americana Marshall are 
sometimes affected on the surface with a species of Avoascus which 
may prove to be a distinct one, but for the present it seems best 
to place it as a variety of this species, especially since the speci- 
mens were found on one of the same trees, though not in close 
proximity to the affected leaves. While the mycelium is found 
_ rather scantily to some depth in the tissues of the fruit, the stone 
appears to be normally developed, or at least not absent. The 
asci are 25-30 - long by 8-11 ¥ in diameter, and the stalk 
cells are very short. Farther study is necessary to determine the 
limits of the characters. ; 
EXOASCUS MIRABILIS n. sp. ae 
The distorted young buds and shoots of Prunus angustifolia 
Marshall, the Chickasaw plum (P. Chicasa Michx.), | have used as 
the type of this species. It occurs in the Southern States and 
some of the Western. I have observed it for three bart 
(1890-92) in Alabama (and in S. C. in 1889),* where it sometimes 
produces serious injury both to wild and cultivated varieties. The 
buds become transformed into a large clavate or ovate mass of 
tissues, which is usually hollow within and much resembles the 
tissues of the plum “pockets,” caused by Z. Pruni. The surface 
of these hypertrophied buds is covered with the asci. The asc! 
are slightly clavate, rounded or truncate at the free ends, are 25 
-45 long by 8-10in diameter. The stalk-cells are 10-18 «high 
by 5-8 “ in diameter, are usually rounded or truncate at the 
base, and do not intrude between the cells of the epidermis. a | 
uld 
spores are quite regularly elliptical. To this species I also wo 
= a el 
: : on | 
refer specimens from Iowa, communicated by Prof. Pammel, - 
the buds of Prunus hortulana 1. H. Bailey,a closely related species 
and upon P. Americana from the same place. ee 
EXOASCUS MIRABILIS TORTILIS n. var. 
On the fruits of the Chickasaw plum, P. angustifolia Marshall re 
* Erwin Smith reports it from Maryland and Georgia, Journ. Myc. ~ : - e 
