What Is It?

Recently I showed a picture of this same type of stuff that I found in one of my vegetable garden boxes in my back yard. A couple of days ago I found this in the front yard. It is really weird, especially because it was sitting on top of the grass, unlike a toadstool. The next day there was one more. I don't have a clue as to what it is. It looks light and airy, unlike something that a cat or dog would vomit. Next time I will cut it open to see what its structure is like--maybe that will help!