Panellus stipticus is common to parts of Australia, Europe, and North America where it is primarily found in clusters around beech, oak, and birch trees.
Most interestingly, P. stipticus is capable of bioluminenescence, as demonstrated by the image above. This ability is the result of an oxidative enzyme known as luciferase, which enables the production of light through the oxidisation of a pigment known as luciferin.
I would love to witness an entire forest of these in the dark of night - that would be something special.
(via Cool Like Pie)