BIOLOGIC SPECIALIZATION IN THE GENUS SEPTORIA 
15 
Poa compressa 
Poa pratensis 
Bromus sterilis 
Calamagrostis epigeios 
Calamagrostis langsdorfii 
Digitaria sanguinale 
Panicum scribnerianum 
Paspalum orbiculare 
Alopecurus agrestis 
Avena planiculmis 
Carex riparia 
Two series of inoculations were conducted to ascertain whether there 
was any variation in susceptibihty among the varieties of Triticum vulgare. 
In the first series, Turkey Red, Minnesota ReHable, Red Cross, Red Hussar, 
and Home Grown spring wheat were about equally infected. Pesterboden 
and Malakoff were infected to a less degree than the above named varieties, 
while Hungarian was but slightly attacked. In the second series, detailed 
data were recorded. In terms of percentage, Turkey Red and Beloglina gave 
each about 52 percent infection if the leaves that had one or more spots 
of infection were counted. Pesterboden and Malakoff gave 43 percent 
and Hungarian only 25 percent. This is not a correct basis of comparison, 
however, for the individual leaves of Turkey Red and Beloglina had the 
largest and most numerous spots with pycnidia in the greatest number. 
In Hungarian, often but two or three pycnidia were present on a leaf, while 
with Pesterboden and Malakoff the condition was intermicdiate. 
Septoria malvicola Ell. & Mart. 
A Septoria determined as S. malvicola Ell. & Mart, was collected upon 
Malva rotundifolia near Hutchinson, Minn. The common mallow is the 
only host reported for this fungus. The fact that this Septoria gave almost 
TOO percent infection (diagram 5) when transferred to Althaea rosea, 
the hollyhock, suggests that the fungus may be identical with Septoria 
fairmani E. & E. described on this plant. The identity appears evident 
when the spot characters produced upon the hollyhock by the mallow 
Septoria are compared with those of 5. fairmani as described and as found 
in exsiccati. The spots on the mallow are smaller and are commonly sur- 
rounded by a broad yellow zone. When the fungus was transferred to the 
hollyhock this yellow zone did not appear, but instead only the narrow 
black border coincident with the limiting leaf veins was present, features 
given for 5. fairmani. When these spots obtained by the inoculation of 
the hollyhock were compared with 6*. fairmani, North American Fungi 
^o- 3557> there was agreement in all essential points. In the morphology 
