This Mushroom Starts Killing You Before You Even Realize It | Deep Look

As humans, we have an innate attraction to
nature. A childlike curiosity. But beware of what you find in the shadows. In Northern California, something deadly is
popping up in the forest. This poisonous mushroom is known as the “death
cap.” Donna Davis: The forest was just damp. Perfect. Donna Davis went collecting mushrooms one
day in 2014. Donna: It’s very magical when you’re there.
It really is quite like a treasure hunt. I felt confident enough that I knew what I was doing. But she didn’t recognize the telltale cup-shaped tissue that grows on the bottom of the deadly mushroom. And she mistook young, egg-shaped
death caps for something she could eat. Donna: And I made mushroom soup. It was amazingly
delicious. One cap has enough toxin to kill a human being. Donna: The next morning I felt really tired
and I took a little nap. For the first six to 12 hours you feel OK. But meanwhile, the toxin is quietly destroying
your liver cells. Donna: The next thing I knew I was in emergency
care. Death caps spread the same way other mushrooms
do. Just like this harmless oyster mushroom, a
death cap shoots hundreds of thousands of spores into the air. The spores drift into the shadow of California
live oaks, where they grow filaments that attach to the trees’ roots. Each fungus filament
is about the width of a human hair. Under the microscope, you can see how the
white fungus envelops the tree’s pink root tips. This is called a mycorrhizal relationship. The fungus feeds on the trees’ sugars and
gives it nutrients in exchange. It’s good for the fungus and for the tree. And that’s how the death cap snuck into California from Europe on the roots of a decorative shrub, in the 1930s. Researchers aren’t sure why the death cap
has evolved to be so lethal. What exactly is it protecting itself from? Humans — we’re just collateral damage in
some battle that we don’t understand. Scientists like Anne Pringle, from the University
of Wisconsin, are doing genetic testing on death caps to see how long they live. If death caps have a short lifespan, it might
be enough to pluck them from the ground so the spores can’t spread. Less opportunity
for people to eat them. Donna: I remember closing my eyes and seeing like
this beautiful path. And all of a sudden everything got really dark. And I thought, “Oh, I’m not supposed
to go down this path.” Donna survived. But death caps killed two
people in California that year. Donna: It is really brutal. Nature has its
own rules. Do you love seeing weird and wonderful scenes
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