The forest floor was nothing but patches of brown. No ferns, no brush, no flowers, and definitely no wildlife. Everything was dead except for rows of hand-planted baby trees.This is what reporter Nate Halverson found while mushroom foraging in the California wilderness near Lassen Peak. He would learn the area had been sprayed with the controversial weed killer glyphosate, more commonly known by its brand name, Roundup.This week on Reveal, Halve…