Member of
genus Podosphaera
powdery mildews (family Erysiphaceae)
higher ascomycetes (subphylum Pezizomycotina)
ascomycete fungi (phylum Ascomycota)
fungi including lichens (kingdom Fungi)
galls
ninebark powdery mildew
Podosphaera physocarpi
1 unobserved taxon / 1 key
Chris’s observations: none