At least on my Samsung, Bixby Vision immediately identified it as coprinus comatus. I assume iPhones have a similar feature in the camera app.

All it does is search the web for related images, and in this case, all the related images were of that exact same mushroom. I clicked one of the images, and found the name of the mushroom.

When you're looking at your picture there's a little "i" you can click on and it'll list related web searches.