Phylum: Oomycota Family: Peronosporaceae
Peronospora farinosa (Fr.) Fr.
A downy mildew found mainly on Fat Hen Chenopodium album, but also on Spear-leaved Orache Atriplex prostrata. Common
References:
Ellis & Ellis (1997) - Microfungi on Land Plants
Termorshuizen & Swertz - Dutch Rust Fungi