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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Having having just agreed with a new post of A. pantherina I thought I'd take a look at the back catalogue. I'm pretty convinced that this is A. excelsa, The veil on the cap is grey and I've often seen A. excelsa like this, at this stage, with a dark brown cap. A. pantherina veil is whiter, even at this stage, unfortunately it's too early to see the other distinguishing features.
I think you are right. The warts are certainly grey.
Please feel free to revise the ID and I will agree to it.
OK I'll put in an ID of A. excelsa.. It is a very varied species and many think it will be split when the DNA is looked at.
Lat/Lng: 53.698, -1.9279
OS grid ref: SE048223