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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Is it growing on?
It's a bit tricky, because it looks as if another fungus is growing on it (the white "fur").
I wonder if it might be Many-zoned Polypore (Trametes versicolor): that species is variable, but almost always has the white edge. But I'm not confident enough to offer it.
I agree with Amadan rather tricky measurements would help plus tree type,if it's when the leaves have fallen a rough idea can be found by the leaves lying on the ground also you could remove one bracket and get a spore print all you do is put it pore side down on a sheet of paper and cover with a jar overnight and hopefully you will get a colour on the paper.The pores look rather large for many zoned polypore.
to the site yesterday. The fungus in the first image is about 5cm across, and in the second image about 15cm across
The dead logs piled around were Silver Birch and Alder, there were no dead leaves around. I think this specific example was on Alder.
Thanks for the instructions on how to obtain a spore print, which I followed. There was no colour on the paper this morning but the underside of the fungus had taken on a purplish tinge - image now included above.
Lat/Lng: 54.67764, -1.74999
OS grid ref: NZ162314