I took the pick today. The tree is a rotten Elm. It died ~20 years ago. I didn't remove it then - it seems to be a good home for woodpeckers now. The ash tree at the left could be next. Many ash trees are going extinct here [Cent. Europe] now because of a fungus. It has been first detected in 2007.
Hymenoscyphus pseudoalbidus - Wikipedia, the free encyclopedia