Peronospora minima Wilson, 1914
upper side of the leaf with pale spots. Underside locally with a grey fungal down of erect conidiophores that apically several times are dichotomously branching, each branch ending upon an egg-shaped conidium.
Saxifragaceae, narrowly monofaag
Brandenburger (1985a), Klenke & Scholler (2015a).