Fungi are a billion years old. Probably. Maybe even older – like, another half a billion years older. Maybe more.

Stop to process that for a second. 

If you look at the history of the earth as a 12hr clock, man shows up at about 11:59 and 58sec. Civilization starts about a tenth of a second ago.

Fungi have been here since at least 8:00. Maybe longer. Maybe a lot longer.