284 Wisconsin Academy of Sciences, Arts, and Letters, 
leaves of Quercns bicolor. Blue River, Wisconsin, August 2, 1921. 
Exceptionally straight conidia occur while some might perhaps be 
called rostrate. 
Fig. 1. Vertical section of acervulus of Septogloeum querceum n. sp. on 
leaf of Quercns bicolor with sporules in various stages of development. Drawn 
by E. M. Gilbert with the aid of camera lucida. 
[This was collected again in 1922 and was grown on nutrient 
agar by Miss Helen Johann and in addition to the conidia there 
was development of pycnidia with spermatioid contents. Later a 
collection was made at Blue River that no longer bore conidia on 
the lower surface but with pycnidia on the upper surface with 
spermatioid, imperfectly developed, contents. Some of these leaves 
were kept in a moist chamber by Miss Johann and developed hya¬ 
line, globose, delicate walled sporules 3-4/a in diameter. When 
germinating in water these sporules developed first a bud and then 
bud and sporule developed each a germ tube. Often the bud was 
nearly and sometimes quite as large as the sporule. Later (Sept. 
2) a collection was made at Arena with similar sporules in the 
pycnidia and acervuli on the lower leaf surface. For the purpose of 
filing I have designated this pycnidial state Phyllosficta quercea 
n. sp. ad interim. 
In circular groups or later on orbicular brown spots or irregular 
areas; pycnidia epiphyllous, immersed in the palisade layer, dark 
brown, globose to elliptical, the longer axis parallel with the pali¬ 
sade cells, 60-100/a in diameter; sporules hyaline, globose, delicate 
walled, 3-5/a in diameter. On leaves of Quercns bicolor. Arena and 
Blue River, Wisconsin. 
From observation of the cultures Miss Johann is of the opinion 
that the Septogloeum and the Phyllosticta represent distinct organ¬ 
isms, the mycelium of the former growing very slowly, that of the 
latter much more rapidly. By placing leaves in a moist chamber 
she brought about the development of sporules in which one or 
