Swedish id

Genus and species correct Craig,
but it's not a 'tristis', it's another cultivar.
The leaves are what gives it away.
I think they are quite beautiful.
Close enough Eric. It's actually a

Betula pendula 'Dalecarlica'.

We call it "Ornäs birch" since it was found on a farm called Ornäs
in Sweden, 1767. The mother-tree fell over in a storm 1887.
It's been appointed "the national tree of sweden".
Sometimes confused with B. pendula 'Crispa'.