Glowing fungus

Glowing fungus, or Flammulina velutipes, is a mutated variant of the pre-War fungus.

Characteristics
Common in temperate areas (especially in caves and caverns), the medicinal properties of the original mushroom have been enhanced by radioactive exposure, allowing it to be used in a variety of potent medicines, such as herbal treatments or even post-War RadAway. The mushrooms have also developed distinct bioluminescence, making them easily identifiable.

Flowing fungus is a prevalent type of flora in the former United States, found in Appalachia, the Capital Wasteland, the Commonwealth, the Island and as far west as the Mojave Wasteland.

Behind the scenes
Glowing fungus, or Flammulina velutipes is a real world mushroom, commonly known as the Enoki or Enokitake mushroom of Japan.