Myxogastria
... that early mycologists classified species from the class Myxogastria as "fungus animals"?
... that early <a href="./Mycology" id="mwDgQ" rel="mw:WikiLink" title="Mycology">mycologists</a> classified species from the class <b id="mwDgU"><a href="./Myxogastria" id="mwDgY" rel="mw:WikiLink" title="Myxogastria">Myxogastria</a></b> <i id="mwDgc">(random species pictured)</i> as "fungus animals"?