Looks like a lawn. While some would be sad to have a mushroom taken, this one is likely to be annihilated. Without knowing what kind of shroom may not be a good idea. Getting some spores for edible mushrooms to seed the stump may be better, iirc substrate is often sterilised first though so look into it first.

[–] spectre@hexbear.net 8 points 7 months ago

The reason to sterilize is.to endure a controlled environment where your target species is not outgrown by something random. I don't think its going to make much a difference in an uncontrolled outdoor environment where it will be contaminated almost immediately. Its just sort of the luck of the draw

I'm a novice though, so if you have a different perspective I'd be curious to hear it