Quercus robur - Pedunculate oak

It is a large deciduous tree 25–35 m tall (exceptionally to 40 m), with lobed and nearly sessile (very short-stalked) leaves 7–14 cm long. Flowering takes place in mid spring, and their fruit, called acorns, ripen by autumn of the same year. The acorns are 2–2.5 cm long, pedunculate (having a peduncle or acorn-stalk, 3–7 cm long) with one to four acorns on each peduncle. It forms a long-lived tree, with a large widespreading head of rugged branches.

While it may naturally live to an age of a few centuries, many of the oldest trees are pollarded or coppiced, both pruning techniques that extend the tree's potential lifespan, if not its health. A specimen of notable longevity is one in Stelmužė, Lithuania which is believed to be approximately 1,500 years old, possibly making it the oldest Oak in Europe; another specimen, called the Kongeegen (Kings Oak), estimated to be about 1,200 years old, grows in Jaegerspris, Denmark.

Of not pollarded specimens, one of the oldest is the great oak of Ivenack, Germany. Treering research of this tree and other oaks nearby makes clear that it can be estimated as 700 to 800 years old.  

Trunk-scope: from 8 - 10 cm