Hyaloperonospora norvegica (Gäumann) Choi, Shin & Voglmayer, 2011
leaves with pales spots. Underside with a generally very sparse whitish down, consisting of erect conidiophores that apically several times are branching, each branch ending in a conidium.
Draba daurica, nemorosa.
synonyms: Peronospora norvegica Gäumann, 1923.
On Draba nemoralis both H. norvegica and H. drabae may occur, which is unusual for the generally narrowly monophagous Peronosporaceae. They usually differ clearly: drabae forms a dens felty down, in norvegica the conidiophores are diffusely scattered.
Brandenburger (1985a), Choi, Shin & Voglmayr (2011a).