Pear-Shaped Puffball

This fungi often grows in large clusters on rotting wood or lignin-rich humus.

A cross-section of a young puffball will show that they are firm and white inside, but each puffball is a spore factory; like magic the firm white flesh is gradually transformed into a fine powder of brown spore mass. The top of each puffball slowly opens to form an "apical pore", allowing the spores to release in the air.

It's fun to squeeze them!