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Basidiomycota.
Pucciniales: Coleosporiaceae Coleosporium tussilaginis Microscope photograph below. Similar: Miyagia pseudosphaeria is also found on Sonchus but has dark paraphyses surounding the sori |
Microscope photograph
Coleosporium tussilaginis
On Smooth Sow-thistle, Sonchus oleraceus. Broadstone, Dorset. May 2015