Fruticose lichen, Usnea floridana, clinging to a tree.
Caution: Do NOT use iSpot to identify fungi to eat!
Some fungi are very poisonous so a mistaken ID could have serious consequences.
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The link below shows photographs of Usnea subfloridana so you can see the difference in appearance:
Thanks. I can see the black at the base of the Usnea floridana is more pronounced than I imagined. While photographs taken in the field are useful, I am learning that they do not always provide you with all the relative information and angles required to make a confident and accurate identification. Of course, experience helps as well.
Lat/Lng: 51.748275582724, -3.7966775894165
OS grid ref: SN760070
This stage of the bicycle track travels for 4.25 miles alongside the river Tawe. On the other side of the track is woodland.