Thanks. I’m in Europe so a pinch of salt is required. There’s a lot of overlap in species, but still. By substrate I mean what’s it growing on or what are the nearby trees? Is it near an oak or a pine or a beech for example? If you were in europe I’d stick with my id (spore print was important) but even so I am 85-90% sure it’s in the armillaria genus (honey fungus) though. If the ask is practical rather than mycological, you only need to get down to genus level to take measures. Hope that’s slightly helpful!?