on Plantago lanceolata

leaves with tiny warts, less than half a mm, yellow or orange, usually a large number together. They consist of a single infected cell, surrounded by 2-3 layers of un-infected, but swollen and discoloured cells.

Plantaginaceae, narrowly monophagous

Plantago lanceolata.

(Accessed 4/23/2025. Click below for photos.)