An Interloper amoung the Berries

In anticipation of today's thunderstorm I went outside to pick the alpine strawberries. I noticed that they are a bit bigger in size than the one's from Monday's harvest. I also noticed that in the middle of my bushes there was a mushroom! This is most unexpected. I am particularly surprised because I am gardening in a container on the second floor of a building. Where could it have come from?

Mushroom in the Strawberry patch



Aug 29 - 15 berry harvest