Jack-in-the-Pulpit Rust, Uromyces ari-triphylli
Pucciniaceae or Puccinia Rust Family


Small yellow warts on the leaves or inflorescence spathes (the "pulpits") of Jack-in-the-pulpits. These warts are spore-bearing structures called aecia (singular, aecium); the main body of the fungus invades the plant tissues..

A parasite of Jack-in-the-pulpits. Probably occurs anywhere native Jack-in-the-pulpits do. Occasional in Wildwood.

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

Rust on flower

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