Coniothyrium orbicula (Ellis & Everh.) Keissl. 1922

Phyllosticta orbicula Ellis & Ev. Proc. Acad
Phila. 1893: 455. 1894.
? Phyllosticta anceps Sacc. Michelia 1: 532. 1879.
Spots nearly circular in form, occasionally several coalescing and then irregular, white 37
or whitish, with a very narrow, slightly elevated rim, the tissue in the infected spot becoming very thin and translucent, often breaking out and leaving circular holes, reaching a diameter of 1-3 mm., about equally visible on either side of the leaf; pycnidia few, scattered over the infected spot, occurring on either side of the leaf, reaching a diameter of 90-125 p; spores abundant, subhyaline, yellowish in mass, ellipsoid, about 2-3 X 5-9 ju. On Brassicaceae :
Armoracia Armor acta (L.) Britton (Nasturtium Armoracia Fries), New York* Ontario Type locality: London, Ontario, on Nasturtium Armoracia. Distribution: New York and Ontario; also in Europe.