Fruticose Lichen found at base of oak tree, delighted to at last find this variety of lichen.
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.
Definitely not an Usnea species but check Evernia prunastri.
If you compare your specimen with the photos of Usnea articulata shown on the link below you'll see the difference:
Lat/Lng: 52.2, -1.2
OS grid ref: SP6057