That caught my eye, too. Rather than having evolved to eat polyurethane only, and then waiting patiently for us to arrive with dinner, I took this to be an awkw

That caught my eye, too. Rather than having evolved to eat polyurethane only, and then waiting patiently for us to arrive with dinner, I took this to be an awkward way of reiterating that the fungus is the only organism we know of that can eat PU. Which does make me wonder a bit about what it normally eats - resins?