Country: The Netherlands.
According to an AI identification system this might be a Fistulina hepatica.
Looking into it, Fistulina hepatica has an asexual state that does resemble what I see here (Article: Confistulina: a rare and little-known state of Fistulina hepatica)
But I am still not sure. Fistulina hepatica prefers to grow in oak and chestnut. Unfortunately I did not pay close attention at whether the tree was an oak tree when I took the picture, and from the small piece of bark visible in the photo it is hard for me to tell.
Here is a close-up of the surface of this fungus:
That is an interesting observation. I usually see them growing at 90 degrees but I had never really given this any thought. I will pay more attention to this when I see brackets. Thanks!
It’s just an idea, brackets grow normally on fallen trees that are horizontal but I think tree rings are a bit too much for them to compute.