The Mystery Mushroom

I saw this on my way into work this morning. I wonder if anyone can identify it? I don’t know fungi.
My PictureThis app could only identify it as some form of Agaricus, i.e. one of the Agaricaceae. I know it has a fly on it, but that doesn’t mean it is Fly Agaricbut it has also been suggested to me that it might be Amanita Strobiliformis. I’m not convinced by either of these. Does anyone have any suggestions?
Update: a day later, it has evolved!
It’s now starting to look very much like it is indeed Macrolepiota Procera (the Parasol Mushroom), and it is now opening its parasol. I expect tomorrow it will be even flatter.
Update: it is indeed looking flatter, but not in the way I imagined. Somebody squished it.


July 1, 2025 at 6:56 pm
Mu guess is that it is a juvenile Macrolepiota procera also known as Parasol Mushroom.
July 2, 2025 at 9:43 pm
Given the way it has changed (see above) that seems likely