Hooked on Radiation

Like plants that grow toward the sun, dark fungi, blackened by the skin pigment melanin, gravitate toward radiation in contaminated soil. Scientists have observed the organisms -- somewhere between plants and animals -- blackening the land around the Chernobyl Nuclear Power Plant in Ukraine in the years since its 1986 meltdown.

edit: oopsie - link above corrected (though it was amusingly apt that the hypertext led here.)