Picture of a Hazel tree nut, Hazelnut (Corylus avellana)

Hazelnut shell

Picture of Hazelnuts, one with it's shell and one without its shell, from a Common Hazel tree, (Corylus avellana).

Photo by, Horst Frank (Own work) [CC-BY-SA-3.0], via Wikimedia Commons

Hazelnut from a Hazel Tree