136 
Mycologia 
& K.), so common in the southern states, have their uredinia and 
telia on Quercus. Perhaps these specimens are sufficiently differ- 
entiated so that they might constitute a race but with only the 
present knowledge of their culture behavior we believe it best 
simply to include them in the Cronartium Quercus species. It 
is interesting to note that in doing this, after an attempted separa- 
tion, the pendulum swings back to the original contention of Un- 
derwood and Earle (Bull. Torrey Club 23: 405. 1896), in which 
they decided that these macroscopic characters should be disre- 
garded, and not be allowed to “ serve as specific characters of 
equal weight with those which require a microscope to detect.” 
They included the fusiform specimens under Per. cerebrum. 
It seems possible that the form of the gall may be dependent to 
some extent upon the rate of growth taking place in the affected 
• part at the time of infection and for a few months thereafter. 
The preponderance of the fusiform type of enlargement on Pinus 
Taeda in the south might be due to a more vigorous growth of 
the host following the infection period than is likely to take place 
in northern species and localities. 
In separating the Wisconsin specimen under the name Per. 
globosutn we were influenced to a large extent by supposed iden- 
tity of the host and to a lesser extent by minor structural charac- 
ters. The host was given as white pine by a well-known careful 
collector, but there were no leaves with which to verify the de- 
termination. Dr. J. J. Davis has since visited the original locality 
and finding there only the ordinary Per. cerebrum on Pinus 
Banksiana suggested an error with regard to our statement. A 
portion of the twig was then submitted to Mr. C. T. Humphrey, 
of the Forest Products Laboratory, University of Wisconsin, 
who gives it as his opinion that the host cannot be Pinus Strobus 
and that it has all the chief characters of Pinus Banksiana. 
Further microscopic study has also shown us that we laid too 
much emphasis on the variations noted in the peridial cells. 
We are, therefore, convinced that the founding of the species was 
unwarranted. Essentially the same condition holds for Per. me. v- 
icanum which is also now included under Per. cerebrum. With 
regard to this form we were influenced by slight structural varia- 
tions and also by the geographical location. The subsequent 
