Peronospora thesii Lagerheim
on Thesium
gall
underside of the leaf with a grey down of erect conidiophores that apically several times are branching dichotomously, each branch ending upon an egg-shaped conidium.
hostplants
Santalaceae, monophagous
Thesium alpinum, pyrenaicum, ramosum.
references
Brandenburger (1985a: 80), Doppelbaur & Doppelbaur (1974a), Klenke & Scholler (2015a), SÄvulescu (1948a).