The Bleeding Tooth Mushroom. When the soil surrounding the fungus’ root system becomes very wet, it may force water into the roots through the process of osmosis. This creates pressure throughout the organism, which eventually builds up enough to force liquid to the surface of the fungus. Although scientists have not yet decided what this liquid is exactly, they know it appears red thanks to a pigment found within the fungus. It is not toxic, but tastes so bitter as to be inedible.

(New Thinking Allowed)