Close-up of bitorquial ring of <i><a href="https://en.wikipedia.org/wiki/Agaricus_bitorquis" class="extiw" title="w:Agaricus bitorquis">Agaricus bitorquis</a></i>.
<a href="https://en.wikipedia.org/wiki/User:luridiformis" class="extiw" title="en:User:luridiformis">Zonda Grattus</a>
CC BY 3.0
<span class="int-own-work" lang="en">Own work</span> (<a href="https://en.wikipedia.org/wiki/User:luridiformis" class="extiw" title="en:User:luridiformis">Zonda Grattus</a>)