15 
fungus might be obtained. In part, the failure to secure the 
fruiting structures of the parasite was due to the shortness of 
the collecting season. Many of the parasites develop their fruit- 
ing structures late in the fall or early in the spring. Accordingly, 
in order to secure these forms in their full development, a muc 
longer collecting season than the summer months is necessary. 
It might further be noted that many fungi are conspicuous only 
early in the spring or late in the fall. Accordingly, in order to 
secure anything like a complete collection of the parasites grow- 
ing on the woody plants in the Park and the Botanic Garden, 
the work should extend throughout the entire year. It is also 
certain that collections extending over a period of years would 
result in the discovery of additional interesting and economically 
important forms which might escape attention in a brief collect- 
ing period of one or two seasons. 
Since my return to Columbia, I have attempted to further 
complete the identification of the forms collected. As yet, how- 
ever, I have not succeeded in identifying all of the fungi. In 
this connection, I wish to acknowledge the services rendered by 
Dr. J. J. Davis, curator of the herbarium at the University of 
Wisconsin. Dr. Davis has kindly looked over some of the ma- 
terial and aided me in identifying properly various forms that 
were collected. 
In addition to the collections made in Prospect Park and the 
Botanic Garden, several trips to points on Long Island and New 
Jersey were made, in company with Dr. E. W. Olive, of the Gar- 
den staff, and Prof. R. A. Harper, of Columbia University, and 
various fungi occurring on herbaceous plants were then secured, 
as well as those that were found on trees and shrubs. On these 
different trips, more than two hundred different collections of 
parasitic fungi were made. ‘The collections include approxi- 
mately one hundred and fifty different species of fungi. Many 
of those collected in Prospect Park and in the Botanic Garden 
were also secured on these trips. 
Perhaps the most serious disease encountered was one which 
attacked the gray birches in the Botanic Garden. A large num- 
ber of trees had already died and been removed from the grounds. 
Many others were conspicuous on account of the dead and dying 
