peridium
... that the peridium of the bird's-nest fungus forms its "nest"?
... that the <b id="mwEhA"><a href="./Peridium" id="mwEhE" rel="mw:WikiLink" title="Peridium">peridium</a></b> of the <a href="./Nidulariaceae" id="mwEhI" rel="mw:WikiLink" title="Nidulariaceae">bird's-nest fungus</a> forms its "nest"?