354 Report oF THE HorTricuLTuRIST OF THE 
limbs made a greater growth when inoculated into pear trees than 
the cultures did that were made from diseased pear trees. 
Various other inoculations were made that are not given in the 
table, the details of which need not be entered into here; it may 
be said, however, that of something over 1,000 inoculations made 
in 1899 very few gave negative results. Tig. 1 of Plate V. 
shows an apple tree whose top is dead, the result of inoculations 
made with cultures of Sphaeropsis obtained from sumach. It 
should be pointed out, however, that this particular branch was 
making a feeble growth, and that inoculations made in two of the 
side branches failed to grow. In several other instances where 
inoculations were made in weak trees the fungus made a much 
greater growth than it did in adjacent vigorous trees. This point 
is of great practical importance and confirms what has been said 
on this subject on a former page. Fig. 2 of Plate XX XII shows a 
twig blight of pear and apple trees respectively, the result of in- 
oculations made with cultures of Sphacropsis from cankered apple 
tree limbs in twigs of the current season’s growth. 
The results of the imoculation experiments tend to show that 
the number of species of Sphaeropsis can be materially reduced. 
In some instances it appears that a new host has served as a basis 
for making a species, and since many of the hosts given in the 
table represent different species it would seem that this plan had 
been followed when some of these species were made. So far 
as the writer can determine there is but slight difference in the 
morphological characters of the species that are represented in the 
tables by the different hosts, such as might occur with any fungus 
when grown on different media or when transferred from one 
plant to another. Neither do the published descriptions of these 
species suggest any material differences. 
A set of the Sphaeropses on the different hosts was submitted to 
Mr. J. B. Ellis, Newfield, N. J., for identification with the pub- 
lished descriptions. His determination of the species so far as 
he was able from the specimens sent are given in Table IIT. 
