Phyllosticta geranii

Phyllosticta geranii Ellis & Ev. Jour. Myc. 3: 130. 1887
Spots small, definite, circular or subcircular, or more rarely irregular in form, whitish, the infected tissue thin and translucent and often deciduous, surrounded by a definite, slightly elevated, dark-colored rim, similar on either side of the leaf but paler on the under surface, reaching a diameter of 2-3 mm.; pycnidia scattered over the infected spot, restricted to the upper side of the leaf, reaching a diameter of 80-100 n; spores very numerous, minute, ellipsoid, 1-2 X 3-6 fx.
On Geraniaceae:
Geranium carolinianum L., Louisiana. Type locality: Point a la Hache, Louisiana, on Geranium carolinianum. Distribution: Known only from the type locality.