21 
The sunflower rust, Puccinia helianthi Schw., was quite preva- 
lent on the annual sunflowers in the Garden. The hollyhock 
rust, Puccinia malvacearum Mont., was common in the Park. 
A number of foliage injuries of several varieties of trees were 
observed which were not associated with any fungus. The leaves 
of both the European and American beeches were characterized 
by the occurrence of conspictious yellow or brown areas between 
the veins. This appearance was probably due to sun scorch. 
Sun scorch seems to be due to excessive transpiration brought 
about by the prevalence of warm, dry winds, especially in the 
early summer, when the roots cannot furnish an adequate supply 
of water. Closely related to this was the burning of leaves, 
which occurred in a striking manner in the sugar maple. On 
some trees most of the leaves had a bronzed appearance, the 
margins of the leaves especially being dead and of a reddish 
brown color. Similar appearances were noted on a number of 
other trees and shrubs, such as the sycamore maple, the varnish 
tree, the ash, and the barberry. 
Slime-flux was particularly prevalent on the elm. On a large 
proportion of these trees there was a marked exudation of a 
slimy, discolored sap from conspicuous cracks on the main 
trunks. The exudation occurred from cracks or crevices near the 
top of the main trunk where the large limbs branched off. In ad- 
dition to giving the trees an unsightly appearance, slime-flux may 
cause permanent injury to the bark and the underlying tissues. 
The trees and shrubs of a city park cannot be looked upon as 
entirely isolated from those of the surrounding region. Diseases 
on the latter may prove a serious menace to the plants in the 
park. It is essential then to have information as to the occur- 
rence of serious diseases in the adjacent areas. In order to ob- 
tain some preliminary information on this question, occasional 
collecting trips were taken to several places on Long Island and 
other points adjacent to New York City. In the time available 
no complete survey was possible. Various parasitic fungi were 
collected on these trips, but special attention was paid to the forms 
on woody plants. A large number of fungi were secured from a 
variety of hosts, many of which were not found in the Park or 
the Garden. Among those collected were species of Cercospora, 

