374 
Exoascus Crrasi (Fuckel) Sadebeck. 
To this species I refer the specimens collected at Germantown, 
Pa., on “ escaped cherry trees,” by Prof. Meehan, and distributed 
as Exoascus Wiesneri Rathay, in Ellis’ N. A. F. no. 2286, It forms 
Witches’ Brooms” and agrees in all essential characters with 
Sadebeck’s characterization of this species which occurs on Prunus 
Avium \.. and P. Cerasus L. in Europe. Prof. Meehan writes me 
that the cherry trees from which the specimens were gathered are 
P. Avium L. . 
Exoascus communis Sadebeck. ; 
_ This occurs on the fruit of Pranus maritima Wang., forming — 
“pockets” (Dartmouth, Mass.), P. pumila L., P. nigra Aiton (Alma, 
Mich.), and P. Americana Marshall (Seymour and Earle, Economic 
Fungi, no. 13, Madison, Wis.). It differs slightly from 2. Pru — 
Fuckel, the asci being quite regularly clavate and the stalk-cells 
proportionately more slender, pointed below, and according to 
Sadebeck (1. ¢) they do not intrude between the cells of the 
epidermis. 
Exoascus Fartowi Sadebeck. 
This deforms the fruit and floral envelopes of Prumus Sere” — 
tina L. According to Sadebeck (I. c.), the asci are not crowded : 
but separated from each other. In the examination of a larg’ 
amount of material from different parts of the United States, | 
have rarely found this to be the case. There are, however, other | 
characters mentioned by Sadebeck which make it a good species: — 
EXOASCUS CONFUSUS n. sp. . 
: This name I have proposed for the species which deforms ” ie 
fruit and floral envelopes of Prunus Virginiana L. A study of 3 
the structure of the fungus has convinced me that it is pig: a 
cally distinct from &. Pruni on P. domestica. The asci spe ri | 
fruit of P. domestica I have found, in the specimens exane 
constantly more slender, and the stalk-cells also more slender pro” 
portionately than those on the fruit of P. Virginiana. Thee 
30-45 long by 8-12 in diameter. The stalk-cells are 15-30" 
long by 6-10 “ in diameter; they are nearly oF ane oa 
‘same diameter as the asci and are proportionately longer : a 
those of E. Pruni on P. domestica. The proportion betweet o 
