Yellow rust causing distortions to leaves of Sallow.
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.
Well Robert and Alan, YOU are certain. That's good enough for me but my agreement is based on this http://www.ispotnature.org/node/706540
Lat/Lng: 51.9, -2.1
OS grid ref: SO9724