Triphragmium ulmariae
EN · meadowsweet rust gall
LV · vīgriežu rūsa
LV · vīgriežu rūsa
https://en.wikipedia.org/wiki/Triphragmium_ulmariae
The fungus grows in the petioles and/or midribs of the perennial plant meadowsweet (Filipendula ulmaria), a member of the rose family, causing swelling and distortion. Sori develop with bright orange spores. The rust's spores reach the new meadowsweet plants via air movements. The rust has a severe effect on the survival of meadowsweet seedlings.
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