This fungus causes discrete, small spots 0.25 inch (6 mm) or less diameter on several species of maple. The spots first appear as brown dots; as they enlarge, their centers become tan. Phyllosticta also is known as “eye spot,” or “purple eye spot” disease because the spots have a red or purple border (Fig. 78). With time, black fruiting bodies of the fungus appears on the spots(Fig. 79). Occasionally, adjacent spots coalesce to form irregular dead areas on theleaves.