Bracket fungus with grey edge
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.
Not sure this is Razorstop fungus, as it only grows on Birch and the edge doesn't look quite thick enough. At a guess it could be Postia (Blueing bracket) or Inonotus dryadeus (Oak Bracket).
It definitely is not Razor Strop Fungus. With the algae on top of the bracket I would take a guess that it could be Trametes gibbosa but I need to see the pores an know what species of tree it is growing on. I can think of three more species it could be.
Lat/Lng: 51.558825523928, -1.8342601507902
OS grid ref: SU115844