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).