Brown crust fungus on a coppiced Hazel. What is this?
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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Very strange, I wonder if it is a fungus at all, did you take it apart at all or collect some if the wood was being coppiced. Might it have been where the branches were rubbing or had been damaged and this might be a reaction by the tree?
There has been no recent coppicing, but if I can find it again I will collect some. Possibly it might be some sort of gall. It doesn't seem to be placed where the twigs can rub against anything.
Lat/Lng: 51.3874, 0.031
OS grid ref: TQ414673