Dead elm and cherry tree roots/stumps from what I have heard. Elm had been pretty much gone for decades so that option will be disappearing. But it's been cold here until today so next week in the turkey woods I won't even bother looking. But to an earlier post, my dad became a fan of the "shaggy Maine" that apparently grows where ever it wants to. Apparently they should not be eaten if you are consuming adult beverages...we were close to calling the local EMS after a deck party where he mixed the two...