Rhytisma acerinum

Maple Runzelschorf

The Maple Runzelschorf ( Rhytisma acerinum ) is a type of fungus from the group of the Ascomycota. This type triggers maple species from the so-called Teerfleckenkrankheit.

Features

The fruiting body is about 10 to 20 millimeters wide, its surface is wrinkled. It consists of round, black stromata. This develops within maple leaves and arching them on. In the spring, gray to pale ocher- colored, oblong spiral fruit slices show ( apothecia ) at locations where ruptures the surface of the leaves. The spores measure 50-75 × 1,8 to 2 microns. They are hyaline, long filiform, smooth, and their content is granular. The asci are cylindrical - clavate. The paraphyses are ply. At their head, they are often curved or forked.

Occurrence

The species grows on the leaves of maple species, and in particular pointed maple ( Acer platanoides ). In late autumn is often the conidia to see the teleomorph occurs in spring and is rare.