Gautieria
... that species from the underground-dwelling mushroom genus Gautieria are the preferred food source of the Northern flying squirrel?
... that species from the underground-dwelling <a href="./Mushroom" id="mwC3c" rel="mw:WikiLink" title="Mushroom">mushroom</a> genus <i id="mwC3g"><b id="mwC3k"><a href="./Gautieria" id="mwC3o" rel="mw:WikiLink" title="Gautieria">Gautieria</a></b></i> are the preferred food source of the <a href="./Northern_flying_squirrel" id="mwC3s" rel="mw:WikiLink" title="Northern flying squirrel">Northern flying squirrel</a>?