This walnut was one out of a set of eight, probably the most northern
mature plantation in Sweden.
It was the only one who got this "treatment" and the condition was so bad
that we had to take it down last autumn. It was strangulated and rotten.
On a side note. Spring is really late this year in Stockholm.
I took these pictures only yesterday.
It's a Tilia, a street 1.6 km of Acers (Faasen's black, I think), and
the collection of Juglans mentioned above.
/ Oskar