Spring Beauty Rust, Puccinia mariae-wilsoniae
Pucciniaceae or Stem Rust Family

Infected leaf

Small yellow cup-shaped warts on the leaves and stems of spring beauties. These warts are spore-bearing structures called aecia (singular, aecium); the main body of the fungus invades the plant tissues..

A parasite of spring beauties and closely related species. Probably occurs anywhere native spring beauties do. Occasional in Wildwood.

Unlikely to be confused with anything else, given its host plant.

Closeup of infected leaf

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