360 BROOKLYN BOTANIC GARDEN MEMOIRS 
Avenae, infected Secale cereale as well as Avena sativa. Eriksson, 
however, gives no information regarding the infecting capacity of 
uredospores from the four grasses mentioned. 
Jaczewski (68) made fairly complete tests with aecidiospores from 
the barberry, obtained by inoculation with teleutospores from various 
gramineous hosts. He records exact correspondence between the 
results obtained with the aecidiospores and uredospores from the 
grasses used as a source for the teleutosporic infections of the barberry. 
Pritchard (110) found that aecidiospores from barberry in the open 
infected Avena sativa, A. fatua, Agropyron tenerum, A. repens, Hordeum 
jubatum and Secale cereale, but not Hordeum vulgare nor Triticum vul- 
gare. They thus correspond to the infecting capacity of uredospores 
from the gramineous hosts. 
Stakman’s (143) results are in harmony with those mentioned. In 
one trial, the barberry was infected with teleutospores from wheat, 
although standing in the open. The aecidiospores, when inoculated 
onto various plants, infected the following: wheat, barley, oats, rye 
and Triticum monococcum. In another test, aecidiospores from the 
barberry, produced by inoculation with teleutospores from Agropyron 
repens, infected wheat, barley, and rye, but not oats, while a similar 
series, starting with teleutospores from wheat, infected wheat, barley, 
rye, but not oats. These results are in close correspondence to those 
previously mentioned for uredospores. 
Arthur (7, 8, 10) has infected the barberry with teleutospores from 
Agrostis alba; the aecidiospores produced infected Hordeum vulgare 
and Triticum vulgare but not Avena sativa. Teleutospores from 
Elymus canadensis also infected the barberry but the aecidiospores 
developed failed to infect Secale cereale and Triticum vulgare. Other 
results of Arthur are the following: aecidiospores from barberry, 
arising from inoculation with teleutospores from Agropyron tenerum, 
infected Avena sativa and aecidiospores, arising from inoculation with 
teleutospores from Sitanion longifolium, infected Triticum vulgare. 
Freeman and Johnson (57) studied the variations in the size and 
shape of the uredospores of the different races. While the uredospores 
of the same race varied considerably in these points, yet they found 
well-defined differences in the uredospores of the various races. 
Stakman and Piemeisel have made similar studies and confirm the 
conclusions of Freeman and Johnson. 
Puccinia coronata Corda.. Next to Puccinia graminis the crown 
rust of grasses has been the most extensively investigated rust from 
the standpoint of its heteroecism and its restriction to hosts. De- 
Bary (17) first established the fact that the aecidial stage of a crown 
rust on grasses occurred on Rhamnus. Plowright (108) seems to have 
