Disclaimer: Afterwards I learned it’s not legal to pick mushrooms in the Netherlands from public land. Sorry Netherlands.
Location: Zuiderpark, Rotterdam
Polyporus Squamosus (suspected)
Ganoderma Applanatum (suspected)
Update 5/24/21:
After sitting in my fridge vegetable draw since I made this post, I found the Ganoderma had sprouted mycelium from where it was formerly attached to the tree. The mycelium had spread out over the top surface of the mushroom in search of nutrients.