| Host genus | Fungal species | Symptoms and notes |
| Abies | Delphinella abietis | Causes needle blight |
| Herpotrichia parasitica | Parasitic on leaves (needles), causing browning of the tissues | |
| Acanthus | Neoerysiphe galeopsidis | Powdery mildew of leaves |
| Acer | Pleuroceras pseudoplatani | Causes irregular brown leaf spots on A. pseudoplatanus |
| Rhytisma acerinum | Tar spot of leaves, primarily of A. pseudoplatanus | |
| Sawadaea bicornis | Powdery mildew of leaves | |
| Stegonsporium acerophilum | A weak parasite, only reported from exotic Acer species in a cultivated environment | |
| Stegonsporium galeatum | Presumably a weak pathogen, only reported from a cultivated exotic tree; possible threat to Acer pseudoplatanus | |
| Stegonsporium opalus | Apparently a weak parasite, not known from native trees | |
| Stegonsporium protopyriforme | Status unknown, a close relative of a weak pathogen. Only reported from a botanic garden and possibly introduced | |
| Stegonsporium pseudopyriforme | Status unknown, a close relative of a weak pathogen. Only reported from a botanic garden and possibly introduced | |
| Stegonsporium pyriforme | A weak pathogen causing death and dieback of Acer pseudoplatanus, especially of shaded branches | |
| Aegopodium | Mycosphaerella podagrariae | Causes leaf spots |
| Agropyron | Claviceps purpurea | The ergot fungus, infecting inflorescences and forming sclerotia from modified seeds. Highly toxic |
| Alcea | Puccinia malvacearum | Rust on leaves and stems |
| Angelica | Fusoidiella depressa | Causes leaf spots |
| Puccinia angelicae | Rust on leaves and petioles | |
| Anthoxanthum | Claviceps purpurea | As for that species on Agropyron |
| Anthriscus | Puccinia chaerophylli | Rust of leaves and petioles |
| Septoria anthrisci | Causes leaf spots | |
| Arctostaphylos | Exobasidium sydowianum | Causes reddened leaf spots of A. uva-ursi |
| Armoracia | Cercospora armoraciae | Causes conspicuous leaf spots |
| Arum | Puccinia sessilis | Rust of leaves; uredinia and telia are on Phalaris |
| Spermosporina aricola | Causes leaf spots | |
| Astragalus | Stigmatula astragali | A biotrophic leaf parasite, probably not causing significant damage to the host |
| Thecaphora affinis | Infects seed pods, destroying the seeds |