The Fungi world (53) : Pestle Puffball

Off-white when young, but in the mature stage, the Pestle Puffball becomes brownish.
At the end of its life, a perforation in the top opens and its spores are released when the body is compressed by rain drops, falling nuts, etc.

Dutch name : Plooivoetstuifzwam
German name : Beutelstäubling
Latin name : Calvatia excipuliformis