The first pic is a Japanese Climbing Fern which is a very bad invasive species. Normally I use herbicide on these, but all I had at the moment was my knife.

The second pic is a cool shelf fungus that I came across. I think it's called a sulphur shelf (Laetiporus sulphureus). It's also known as chicken-of-the-woods because it has the texture and flavor of chicken. I've never tried it.

The third pic is just my sheath that was resting on my steering wheel.