Aha the bulb looks consistent with phalloides. But there are a few amanitas that look really similar. Here's typically what phalloides look like. https://tse4.mm.bing.net/th?id=OIP.ZJpNxmw_0u33z_mEbSsjkwAAAA
Either way this guy would be a no go for eating lol. It's some kind of Amanita given that it's all white even at this older age I would say its something closer to Amanita bisporigera which is just as deadly as phalloides and basically the same common name "destroying angel".
I certainly was not going to bite it 😉. It was growing a few meters from where I've been scattering spores from different fruit bodies. So far all I've been seeing is what has been common to the yard.
Yeah I typically avoid anything that looks even remotely similar to a white amanita or amanita in general.
I think bisporigera is a good candidate.