422 BOTANICAL GAZETTE [NOVEMBER 
conidia of S. fructigena and of S. cinerea which were sent from 
Europe, and with conidia from Sclerotinia-infected plums grow- 
ing in Worcester. The growth of S. fructigena was very slow, 
however, producing in two weeks large, yellowish conidial tufts 
which arrange themselves in rings (fig. 1, A). The quinces inocu- 
lated with S. cinerea and the local Sclerotinia behaved in exactly the 
same way, both turning the fruit brown but producing no conidia. 
In different varieties of apples, 25 experiments gave exactly similar 

A B 
1G. 3.—A, S. fructigena on a pear; inoculated from fruit obtained from Dr. Luict 
MonTeMARTINI of Pavia; B, local Sclerotinia on a pear exactly similar to A; this pear 
was inoculated ro days after A, and both photographed the same day, 13 days after 
the inoculation of A. 
results as those obtained with the quinces, that is, large, yellowish 
conidial tufts from the S. fructigena, and no conidia at all from the 
S. cinerea and the local Sclerotinia. If the apples were cut 
quarters, and the conidia placed directly on the exposed flesh of 
the fruit, an abundant growth of spores was obtained. Quartered 
apples inoculated in this manner with the spores of S. fructigena 
always gave large, yellowish tufts of conidia. When S. cinerea 
was used, the conidia appeared in small ash-gray tufts entirely 
unlike those of S. fructigena. The local Sclerotinia spores produce 
