I was walking my dog a couple days ago looking for mushrooms to make a mushroom slurry to dump on my wood chips. We had had lots and lots of rain this season and I've never seen so many mushrooms popping up. I don't eat them so I don't know how to identify any, but I took a few pictures. These are all in an area just a few feet from each other.
You probably know not to randomly eat any of them, but do be careful with your hands after you've handled them. At least one there could easily grow up to become a nice, healthy death angel, amanita verrosa.
I love the approach, though. I am gardening in the urban backyard of the house in which I rent. I had no idea what was in the soil, nor was I sanguine as to the partially pyrolised "compost" the city dumped at the park for me. I took a wheelie bin full and put virtually all of it in the composter, and have been inoculating everything in sight with oyster mushroom slurry. I haven't seen fruiting bodies out in the garden yet, but every time I open the composter, there's evidence of a recent flush.
Good luck in your search, and keep us posted.
A human being should be able to change a diaper, plan an invasion, butcher a hog, conn a ship, design a building, write a sonnet, balance accounts, build a wall, set a bone, comfort the dying, take orders, give orders, cooperate, act alone, solve equations, analyze a new problem, pitch manure, program a computer, cook a tasty meal, fight efficiently, die gallantly. Specialization is for insects.
-Robert A. Heinlein