The first 2 pictures show the rust on the day the plant was found. The 3rd picture shows the same specimen on 5 March, by which time the spores had started to erupt from the stem.
Caution: Do NOT use iSpot to identify fungi to eat!
Some fungi are very poisonous so a mistaken ID could have serious consequences.
No interactions present.
Lat/Lng: 51.9, -2.1
OS grid ref: SO9324