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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Looks rather strange for birch polypore, pores look too big. suppose it could just be a close-up of a small specimen.
Yes it is a close up from below. I think they change shape as they grow. I have added another photo of the wider view. Thanks.
Lat/Lng: 51.1, -0.8
OS grid ref: SU8941