Seen growing vertically on a fallen tree, about 15-20 cm from top to bottom, appearance was similar on both sides
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This is a photo of the rotting pores of a fruit-body that was growing horizontally when the tree was upright. Did you take a photo from the other side (the top)
It was on the end of the fallen tree, so not on the sides
The tree must have rolled then. The spores in poroid fungi develop in the tubes and when they are ripe fall from the basidia. The only way out is down so the tubes must be vertical. If a tree falls or is rolled over annual brackets like this one will just die on the tree without releasing the spores. Perennial brackets like Fomes will produce a second (and sometimes third or more) "correctly aligned" part of a fruit-body to enable the spores to be released.
Lat/Lng: 50.6983, -2.0379
OS grid ref: SY974887