Caution: Do NOT use iSpot to identify fungi to eat!
Some fungi are very poisonous so a mistaken ID could have serious consequences.
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Was it on groundsel?
Yes it was. Otherwise I would not have know what rust it was. They all look alike. Is it a safe assumption to make that if it is on groundsel its groundsel rust, or is there something else it could be? I will upload some more pics of the whole plant.
University of Edinburgh and Biodiversity Observatory (OU)
Just checking. At first I thought it was on a walnut tree, before realising that was the name of the location!
Oh, I see. Sorry. I live in a place called Walnut Tree!
Think Puccinia lagenophorae has been tried for biological control of some plants in Asteraceae inc groundsel.
Lat/Lng: 52.0, -0.7
OS grid ref: SP8936