These nettles caught my eye on a lunchtime walk on Monday. They were covered in little red galls, with the bright orange fruit bodies ('aecia') of a rust fungus busting out of them.
Here's one of those little red galls.
The aecia are proper stunning under the microscope.
It looks like Nettle Clustercup Rust Puccinia urticata (based on reference to images on Plant Parasites of Europe) but I'm not sure if there are other similar-looking species which occur on Stinging Nettle Urtica dioica.
For the record
Date: 08/04/2019
Location: Woods Mill
Grid reference: TQ218135
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