In response to Ellyn below...

Yoopers grow their fungi really, really big.

Several years ago [the science journal article was published in 1992--ed.] a “humungus fungus” (a GIGANTIC mushroom) was discovered in the Crystal Falls area. It weighs roughly 11 tons and covers 37 acres. This makes it the largest mushroom (fungus) in the world — it’s hard to believe this monster mushroom is growing in Michigan and not Texas! Based on the average rate of growth through the soil, the Humungus Fungus is probably more than 1,500 years old.

If I'm not mistaken, the Crystal Falls fungus inspired an episode of The X-Files.

Speaking of Crystal Falls, it is one of my favorite places in the entire state. The autumn vista from the high point of town (it's built into a hill dominating the surrounding area) is nothing short of awe-inspiring.