It seems that it's that time of year when mushrooms pop up everywhere. I even found a small one in the pot of coriander growing on my windowsill! The ones above were growing at the foot of a tree in woodland.
How do you know when you can eat wild mushrooms? Easy: just don't, ever, unless you're a triple black-belt fungus identifier, and even those people sometimes get it wrong and end up in A&E.