Puccinia pseudosphaeria
This rust fungus causes leaf spots bearing uredinia and telia on Sow-thistles (Sonchus). The uredinia are surrounded by paraphyses. There is no host alternation. The leaves may be slightly deformed, but this is not a gall-causing species.
other microfungi can cause leaf-spots on sow-thistles
host 
Photograph the rust on the host. Ensure you have noted the host-plant species in your comments. Microscopic examination may be needed.
on sow-thistles
Graham Calow
Sapcote, 'The Bath House'
24 September 2020
rust on Perennial Sow-thistle
(syn. = Miyagia pseudosphaeria)
sue
Nailstone, B585 Bagworth Rd verge
06 September 2024
paraphyses
Graham Calow
Sapcote, 'The Bath House'
24 September 2020
rust on Perennial Sow-thistle
sue
Nailstone, B585 Bagworth Rd verge
06 September 2024
on Prickly Sow-thistle
sue
Nailstone, B585 Bagworth Rd verge
06 September 2024
uredinia
sue
Nailstone, B585 Bagworth Rd verge
06 September 2024
on Prickly Sow-thistle
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