228 
Mycologia 
were found in the vicinity. After a search, old aecia were found 
on Myrica leaves of the preceding year. Material of both species 
of Gymnosporangium was taken to New York City. Gym. Ellisii 
was sown there on Aronia arbutifolia, A. nigra, and several spe- 
cies of Crataegus without result. No Myrica plants were avail- 
able for use. Gym. Botryapites was sown on Amelanchier cana- 
densis and A. Asiatica and produced pycnia and aecia on both. 
The Lakehurst region was again visited in August of the same 
year and aecia were found on Amelanchier, Aronia, and Myrica. 
The aecium on Amelanchier proved to be that of Gym. Botrya- 
pites, the one on Aronia was Roestelia transf ormans, and that on 
Myrica, Aecidium myricatum. Since Gym. Ellisii had failed to 
infect Aronia in the trials made at New York, it seemed probable 
that Myrcia would prove to be its alternate host. This solution 
would still leave Roestelia transf ormans without a telial connec- 
tion and another Gymnosporangium should be present in the 
vicinity. 
A third trip to Lakehurst was made this spring, May 1914, and 
a quantity of Gym. Ellisii was obtained and sent to the Purdue 
Experiment Station for culture work. The germinating telio- 
spores were sown, May 6, on Aronia arbutifolia, Amelanchier 
canadensis, and Myrica cerifera. The sowings were made by Mr. 
C. A. Ludwig, who was in charge of the rust cultures at that 
time. Although the leaves of the Myrica were quite small at the 
time of inoculation, a vigorous infection resulted, and an abun- 
dance of pycnia were produced on May 18, and aecia on June 6. 
No infection was produced on either of the other trial hosts. 
The distribution of Aec. myricatum conforms with that of Gym. 
Ellisii in that both are found along the Atlantic coast from Massa- 
chusetts to Delaware. The latter, however, is also known from 
northern Florida and southern Alabama, while Aec. myricatum, 
so far as I can ascertain, has not been collected at any point south 
of Delaware. 
Aecidium myricatum was named and briefly described by 
Schweinitz, in 1832, from a specimen on Myrica cerifera sent him 
from New York by Dr. Torrey. This description has been ampli- 
fied somewhat by DeToni in Saccardo’s Sylloge Fungorum but is 
