We hid this to make it a little challenge, but easy to find. A short walk into the woods where there are fallen trees (one that you step over right at the end) in various stages of rot.
Park at tennis courts and head for pavilion then left along the woods. Go as far as you can until you find a trail. Follow path until you jump over a fallen tree. Find the mushrooms stump and you are there.
Bohrer Park is at 5705 South Lindbergh, St. Louis, MO 63123
Open: Dawn (1/2 hour before official sunrise) - Dusk (1/2 hour after sunset)