Today I decided to 're stack an old pile of firewood that was on my property when I bought the place. Some of the pieces were pretty big so I got the chain saw to cut them up. When I cut into them I found some nice spalting in what appears to be maple or could be hackberry. Problem is it has gone too far and is soft in over half of the material. I know it could be stablized but not sure it would be worth it. Anyway, you never know what you will find in a firewood pile.