94 SALMON: SUPPLEMENTARY 
Customs House (London), inform me that no importation of 
gooseberries into Britain from the United States occurs. I have 
learned, however, through Mr. F. W. Moore, of the Royal Bo- 
tanic Gardens, Dublin, that two firms of florists in Ireland some 
years ago imported gooseberry plants from the United States. It 
is certainly possible that by this means the disease may have been 
introduced from America. But, on the other hand, we must re- 
member that Ireland possesses some indigenous plants found else- 
where only in North America. Also, as I have already pointed 
out (monograph, p. 72), in the fungus known as Sphaerotheca 
euphorbiae (Cast.), which is not uncommon on the Continent on 
species of Euphorbia, appears to be morphologically indistinguish- 
able from S. smors-uvae. 
It may be noted here that De Wildeman (16) has lately enu- 
merated S. mors-uvae among the Erysiphaceae of Belgium. The 
record runs, “sine loco (Em. Marchal)’”’; up to the present I have 
not been able to obtain any information about this Belgian record. 
It may be well here to draw-attention to the serious economic 
danger with which European fruit farmers will be confronted if this 
‘‘ American gooseberry mildew ”’ is allowed to establish itself in Eu- 
rope. The practical aspect of the subject is ably dealt with by 
Beach (2**), in Bull. N. Y. Agric. Exper. Station, 114, where a 
full and well-illustrated account of the cultivation of gooseberries 
in the United States is given. It is here remarked: ‘‘ The one 
great hindrance to the cultivation of European gooseberries in this 
country is their susceptibility to attacks of the mildew, Spae’? 
theca mors-uvae. From the standpoint of the American fruit 
grower gooseberries falls into two classes, those which suffer from 
the mildew and those which do not. The former class includes 
all European varieties and their American grown seedlings, of 
other words, all varieties of the species Rides Grossularia L. Th 
latter class includes the cultivated varieties of the native America? 
species oxyacanthoides L. and Cynosbati L., and some hybrids be- 
tween them and the European species. * * * On account of their 
liability to serious attacks of mildew, European gooseberries 
should not be planted for commercial purposes, except by thor 
who are prepared to contend with that disease.’’ We may infer 
from these observations that if the fungus were to become wide- 
