It's roughly the size of a three-year old human arm. It appears to be black with a white cap.
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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Photograph taken with a flash. Fungus was found about 1.5 mtrs. up inside a hollow ash tree. I can't find any identification.
The only thing it looks like that I know of is Beefsteak Fungus (Fistulina hepatica). Just wondering if it could be that, but growing on the inside rather than the outside of the tree has caused the unusual shape. The white on the end looks like it may be a mould growing on the fungus rather than the fungus itself.
Lat/Lng: 52.08, -3.28
OS grid ref: SO123431