There Is a Mushroom That Bleeds

Stumbling upon the Hydnellum peckii in a forest can be an unsettling sight. Often called the 'bleeding tooth fungus' or 'devil's tooth,' this strange organism appears to weep thick, ruby-red droplets from the pores on its white, velvety cap. This striking phenomenon isn't blood, but a process known as guttation. When the soil is very moist, especially at night, the fungus can build up so much internal water pressure that it forces excess sap out through its surface. As the fungus ages, this 'bleeding' stops, and its appearance changes dramatically, turning a nondescript brownish-gray.

The 'blood' itself carries more than just water. Its vibrant color comes from a pigment called atromentin, which holds a fascinating secret. Scientists have discovered that atromentin possesses powerful anticoagulant properties, meaning it prevents blood from clotting. This chemical action is remarkably similar to that of heparin, a well-known anticoagulant drug used in modern medicine. Despite its intriguing chemistry, the fungus is not a viable source for this compound and is considered inedible due to an intensely bitter taste. It typically grows in coniferous forests across North America and Europe, forming a beneficial relationship with the roots of trees.