Black alder (<i><a href="//commons.wikimedia.org/wiki/Alnus_glutinosa" title="Alnus glutinosa">Alnus glutinosa</a></i>) leaves, <a href="//commons.wikimedia.org/wiki/Bia%C5%82owie%C5%BCa_Forest" title="Białowieża Forest">Białowieża Forest</a>, Poland.
Agnieszka Kwiecień (<a href="//commons.wikimedia.org/wiki/User:Nova" title="User:Nova">Nova</a>)
CC BY 2.5
<span class="int-own-work" lang="en">Own work</span>