Peronospora parvula Schneider

on Isopyrum

gall

Leaf yellowed. Underside with a very loose whitish fungal down of erect conidiophores that apically several times are dichotomously branching, each branch ending in an acute tip bearing a conidium. The conidia don’t have a papilla.

hostplants

Ranunculaceae, monofaag

Isopyrum thalictroides.

references

Brandenburger (1985a), Klenke & Scholler (2015a).