Physoderma gerhardtii Schröter, 1886
up to 5 mm long blackish brown stripes on the leaves. Embedded in the tissue ovoid resting sporangia.
Contrary to Ph. graminis, that may occur on the same host plants, the growth and development of the host is not disturbed.
Brandenburger (1985a: 826), Klenke & Scholler (2015a).