Neoërysiphe geranii (Nomura) Braun, 1999
mycelium amphigenous, also on the stems, effuse, persistent. Appressoria nipple-shaped or more often lobed, mostly single. Conidia oval, formed in rather short chains, without fibrosin bodies. Cleistothecia with 4-20 asci, that ripen only after hibernation. Appendages from few to 60, sub-equatorial, 0.3-5 x the diameter; they are mycelioid, almost entirely hyaline, 0-8 septate.
Geranium albiflorum, molle, nodosum, pratense, sibiricum, thunbergii.
Outside of Europe also on Erodium.
Asiatic species, introduced into Europe.
Braun & Cook (2012a), Bresinsky (2016a), Klenke & Scholler (2015a), Kruse (2014a).