375 
two structures is more nearly the same as that existing in the 
case of the £. Farlowii Sadeb. on P. serotina, while the asci and 
stalk-cells of £. Pruni Fuckel on P. domestica are more nearly re- 
lated to those of Exoascus communis Sadeb. on P. maritima, pumila, 
nigra, etc. This is what we would naturally expect since P. Vir- 
Simiana and P. serotina belong to a different section of the genus 
Prunus than do P. domestica, etc. The physiological influence 
of the fungus on the fruit of P Virginiana is also different from 
that of Z. Pruni on P.domestica. The floral envelopes are con- 
stantly subject to hypertrophy and also bear asci, in which respect 
it also agrees with that on P. serotina and differs from that on P. 
domestica. 
? 
Exoascus LonGIPEs n. sp. 
This species has been found at Danby, near Ithaca, N. Y., 
Producing “pockets” in the fruit of Prunus Americana Mar- 
shall. It is related to the & Pruni and E. communis types, 
but differs in the long stalk-cells which are strongly in- 
truded between the cells of the epidermis. The asci are 30-40 
* long and 7-10 “in diameter. The stalk-cells are 25-35 » high 
by 3-5 » in diameter, being usually much narrower below. The 
lower ends of the cells of the hymenium begin quite early to in- 
trude themselves between the epidermal cells. 
EXoascus DECIPIENS n. sp. 
This has been collected at A=tna and Danby, N. Y., on 
the leaves of Prunus Americana Marshall. It sometimes produces 
isolated, open, shallow pockets in the Jeaves, but more frequently 
attacks qa large part of the bases of expanded leaves, where it 
throws the leaf into a series of fine, irregular folds. On the lower 
Side of the leaf the asci are scattered or rather loosely meee 
Sated in groups. The asci are 20-40 # long by 7-10 # in dia- 
meter. The stalk-cells are 6-13 “ high by 7-12 # in diameter, 
and are usually rounded below. The spores are oval or broadly 
elliptical, and 3-4 # in diameter. Conidia are frequently de- 
veloped, while still in the ascus, by budding. 
2 The shoots are also attacked, and sometimes enlarged, though : 
T never have seen the asci onthem. Sometimes the young leaves 
are attacked and killed without the development of any asci and 
