For those not in the know, this is one of the Amanita mushrooms referred to as a Destroying Angel. Never, ever, ever, ever forage with an app. Especially for mushrooms.
One day when AI is finally regulated, those regulations will be written in blood
We're currently in the "unregulated wild west cuz no one has died yet" era
The Amanita mushrooms, destroying angel included, are a horrible way to die. Particularly because, like rabies, when you first show symptoms you're already dead.
But that's not what makes Amanita Ocreata and it's relatives awful.
With rabies there is no reprieve: you are sick and get sicker until you die. With these mushrooms, though, you will be sick for a while, and then suddenly you will feel like it has passed, and you are on the mend.
This is a lie. You are about to return to groaning intestinal pain, slip into a coma, and die. Because during that "reprieve" period, as Kingfisher & Wombat note, the active toxin in the mushroom is destroying your liver.
Only forage with a reliable guide, never an app, and if you're not sure don't pick and eat it!