I was trying to do a week's worth of Colour Challenge with mushrooms, but I can't find a green one. I failed.
So, here is some green with a mushroom, the best I can do to stay close to my self-imposed theme:
Olympus Stylus 1s, 42mm, ISO400, f5.6, 1/8s
The closest thing to a green mushroom I have ever seen was this one, but it is just green-ish, more yellow than green:
Olympus XZ-1, 28mm, ISO400, f8, 1/25s