Phyllosticta viridis

Phyllosticta viridis Ellis & Kellerm. Jour. Myc. 5: 142. 1889
Spots irregular in form and with no definite border, yellowish-brown, the diseased area gradually blending into the healthy tissues of the leaf, reaching a diameter of 1 cm. or occasionally covering half the surface of the leaf; pycnidia numerous, quite evenly distributed over the infected spot and often so thickly gregarious as to give the spot a blackish appearance, restricted to the under side of the leaf, reaching a diameter of 60-75 n; spores very minute, about 1 X 4-5 /x.
On Oleaceae:
Fraxinus americana L,., Illinois, New York.
Fraxinus pennsylvanica Marsh. (Fraxinus lanceolata Borkh., Fraxinus viridis Michx.) , Kansas, Louisiana, Nebraska, South Dakota.
Fraxinus sp., Connecticut. Type locality: Rock County, Kansas, on Fraxinus viridis. Distribution: Connecticut to South Dakota and Louisiana.