I've sent in a correction, but until it gets processed and the page is updated, I'm adding this note.
Fungus Spores DO NOT drop the fungalia root. They actually drop off of Corpse Spores; I spent a couple hours, based of the incorrect info on this page, killing fungus spores. None of the 29 I killed had the root. But it occurred to me that maybe the original source of the data got confused, since corpse spores and fungus spores do look similar to eachother. I then proceeded to kill a corpse spore; It dropped the root. So as an experiment, I killed five more...the second, fourth and sixth corpse spores also dropped the root.