''Septoria hydrangeae'' is a

fungal A fungus ( : fungi or funguses) is any member of the group of eukaryotic organisms that includes microorganisms such as yeasts and molds, as well as the more familiar mushrooms. These organisms are classified as a kingdom, separately from th ...

plant pathogen infecting hydrangeas.

References

External links

Index Fungorum

USDA ARS Fungal Database
Fungal plant pathogens and diseases Ornamental plant pathogens and diseases hydrangeae Fungus species {{fungus-plant-disease-stub