Are the jack-o'-lanterns Armillaria??
I really like everything about fairy ring mushrooms. I need to find enough of them to try that cookie recipe I once saw...
It's common to see spindly little mushrooms like that conocybe in grass, isn't it? This morning I saw a single similar mushroom. Except it was quite large for this type. It was towering very high above the grass, and with the same shape cap (also large) atop a slender stipe. Danggit I should have taken a picture but it all happened so fast. This was right by soldier field.