Oak, Acorn, Quercus, Close up of green acorns growing on the tree.

Oak, Quercus robur, Acorns growing on the branches of tree in late summer.

Sessile oak, Quercus petraea, Aerial view of many wet, fallen brown leaves and an acorn.

Oak, Acorn, Quercus robur.

Oak, Acorn, Quercus robur.

Acorn of Quercus robur.

Acorn of Quercus robur.

Oak, Acorn, Quercus robur.

Oak, Acorn, Quercus robur.

Oak, Acorn, Quercus robur.

Oak, Acorn, Quercus.

Oak, Acorn, Quercus robur.