Guignardia haydenii
- kingdom: Fungi
- phylum: Ascomycota
- class: Dothideomycetes
- order: Botryosphaeriales
- family: Phyllostictaceae
- genus: Guignardia
- species: Guignardia haydenii
Leavenworth
Kansas- Lincoln
Nebraska- Newfield
New Jersey
United States