Sessile Oak (Quercus petraea).
“…sessile oak, also known as the Cornish oak or Durmast oak, is a species of oak tree native to most of Europe, into Anatolia and Iran.
Sessile oak has been designated the national tree of Wales, where it is also called Welsh oak. It is also considered the Cornish national tree and is referred to as the Cornish oak.
What was considered to be the oldest tree in the UK was a sessile oak, the Pontfadog Oak. This grew near Chirk in North Wales. It was understood to be over 1,200 years old, an age that was due to regular pollarding for much of its life. The hollow trunk had a girth of 42 feet 5 inches (12.9 m). It was lost in April 2013 when it blew down in high winds.”