One rarely sees a single Pear-shaped Puffball growing on a rotted tree in autumn when no other Pear-shaped Puffballs are present. Some things in nature just happen together, like the sudden appearance of fireflies in early summer. The prolific quantities of Lycoperdon pyriforme--the Pear-shaped Puffball--make identifying this late-autumn regular a bit easier. It’s like when you see 20 fireflies at once in your yard one summer evening and you know, for certain, you are looking at fireflies.