hcmcdole wrote: Probably a mushroom that is feeding off dead organic material in the yard. Did you have a tree or shrub in this area before?
My parents had big silver maples cut down years ago. A few years later my mother noticed some strange growths in the yard and had me look at them when I visited. It didn\'t take long to see that they radiated out from a central point (like the rays of a flower or a kid\'s drawing of the sun rays). Tracing back a few of those lines it clearly came to the center of where the old maple tree once stood. It became obvious that these hard growth mushrooms were feeding off the old roots in the ground.
Check out Armillaria.
My own mushrooms were feeding on a maple\'s roots we had cut down a few years earlier but they were above ground and orange.