Clusters of pear-shaped puffballs (Lycoperdon pyriforme) on fallen log. 
<ul><li>The habit of Lycoperdon to grow on wood is very unusual for puffballs.</li>
<li><a href="//commons.wikimedia.org/wiki/Category:Duke_Forest" title="Category:Duke Forest">Duke Forest</a>, Korstian Division, in Durham County, North Carolina.</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>