Davis—Notes on Parasitic Fungi in Wisconsin — V. 699 
Ascochyta cucumis Fautr. & Roum. On Cucumis sativus 
(cult.) Platteville. (E. Carsner, com. M. W. Gardner.) 
There are in Wisconsin a number of foliicolous Sphaerioi- 
daceae that constitute a definite group as seen in the field. They 
cause blackish brown spots of subcircular form but irregular 
outline with more or less black crustaceous thickening of the 
upper surface. The pycnidia are innate, inconspicuous, few, 
scattered, pale, thin walled with the ostiole directed toward 
the upper surface of the leaf, 100-150/* in diameter and can 
often be distinguished with a strong hand lens and good trans¬ 
mitted light, especially if the leaf is wet. The sporules are 
cylindrical with rounded ends and septate. It is in the size 
and septation of the sporules that variation occurs. What the 
relation of these forms to each other may be is for the future 
to disclose through field observation and artificial infection. 
In the meantime some means of designation is needed and I 
have tentatively arranged them as follows: 
Stagonospora apocyni (Pk. ?) n. comb. Spots definite, im- 
marginate, subcircular, reddish brown, somewhat paler below, 
1-2 cm. in diameter; pycnidia few, scattered, epiphyllous-innate, 
globose, succineous, thin walled, becoming more or less thickened 
and blackened about the ostiole; sporules hyaline, fusoid-cylin- 
drical, 3^-7 septate with a large droplet in each cell, 33-50 x 6/*. 
On leaves of Apocynum androsaemifolium. This is the fungus 
recorded under the name Septogloeum apocyni Pk. in the provi¬ 
sional list. The material at hand of that species, on Apocynum 
cannabinum does not enable me to determine whether that is also 
a Stagonospora. Certainly the sporules are similar. 
Next comes a form on Cirsium. 
Stagonospora cirsii n. sp. 
On circular brown or cinereous spots, often with a whitened 
center y 2 -l cm. in diameter or on large brown areas; pycnidia 
few, scattered, innate, depressed-globose, brown, ostiolate, 125- 
150/* in diameter; sporules cylindrical, ends rounded, straight 
or slightly curved, hyaline, 2-5 septate, not constricted, 20-32 
x 5-6/x. On Cirsium altissimum. Maiden Rock, Wisconsin, 
August 7th and 16th, 1916. 
Next is Ascochyta lophanthi Davis (Trans. Wis. Acad. 14:95) 
on Agastache scrophulariaefolia with uniseptate sporules 20-30 
x 10-12/*. 
