I get these big-ugly volleyball sized things around and under drip lines of trees on one property. If you allow them to reach full size, they burst open and omit a foul smelling ooze that attracts gnats. The odor is so foul that it can make you nauseous.
It all depends on what species of mushroom it is. Some are normal and some are indicator's of Armillaria!...........shoestring fungus for hardwoods.