Davis—North American Ascochytae 
655 
NORTH AMERICAN ASCOCHYTAE 
A Descriptive List of Species; Compiled by J. J. Davis. 
A list of North American species of Phyllosticta was published 
by Ellis & Everhart in 1900 and a similar list of species of 
Septoria, Phleospora, Rhabdospora and Phlyctaena prepared by 
Dr. George Martin and Mr. J. B. Ellis was issued in the Journal 
of Mycology, vol. Ill [1887]. The present list enumerates 
species of another of the genera of the same group. 
To the genus Ascockyta are referred species the sporules of 
which, as ordinarily observed, are uniseptate and so remain; 
those in which the sporules remain continuous nearly or quite to 
the time of full maturity becoming then uniseptate; species in 
which a majority of the sporules are continuous but a minority 
uniseptate. In the first two classes 2-3 septate sporules occur 
rarely. Species in which the sporules are uniseptate until ma¬ 
turity becoming then triseptate are referred to Stagonospora. 
Ascochyta is separated from Phyllosticta on the one side and 
Stagonospora on the other by somewhat shadowy lines. Some 
species that have been placed in this genus I am referring to 
Stagonospora and to Marssonina. 
1 Ascochyta achlydis Dearn. (Mycologia 8: 101-2.) 
Spots scattered, numerous small ones, 2mm., mostly sterile, 
and a few large ones 1 cm. or more in diameter with a central, 
sharply delimited, thin, arid, deciduous area surrounded by a 
diffuse dark red or purple brown border 1-5 mm. in width; 
pycnidia nearly concolorous with the arid area, epiphyllous 
although visible from the under side, 150-200^; sporules hya¬ 
line, 2-3 guttulate, obscurely uniseptate, rounded at the ends, 
14-20 x 5-6%^. On leaves of Achlys triphylla. 
