I found this interesting fungus in my garden a moment ago right at the surface of the soil. I see lots of puffballs here so maybe it's just an early puffball. I keep hoping to find truffles . . . The alligator lizard is another recent discovery in the garden - can't resist showing him off. PS I think I can answer my own question. When I went back outside after posting the above, I found a cluster of other fungi that looked much the same and which I recognize as puffballs. When I broke one open, it looked the same in the middle as the one in my photo.