Pear-shaped puffball (Lycoperdon pyriforme) on fallen log, closeup. 
<ul><li><a href="//commons.wikimedia.org/wiki/Category:Duke_Forest" title="Category:Duke Forest">Duke Forest</a>, Korstian Division, in Durham, North Carloina.</li></ul>
<a href="//commons.wikimedia.org/wiki/User:Dcrjsr" title="User:Dcrjsr">Dcrjsr</a>
CC BY 3.0
<span class="int-own-work" lang="en">Own work</span>