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Old 7th May 2018
Harold Gough Harold Gough is offline
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Re: Communal flowers, trees, plants and fungi thread

Like Tiny Flowers: Arum Rust Puccinia sessilis

I have seen references which say that this species is rare. We readily found it on the leaves of Arum maculata in local woodland at the weekend and it is present on at least half of the A. maculata growing wild in our garden.

The infection is easily recognised when the aecial cups are present. These flower-like cups are similar in various species but are arranged differently. These cups, each about 0.5mm in diameter in this species, contain spores.

Due to Arum leaves not being totally flat, I have been unable to get a whole colony sharp.

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