Pokemon mascots for Hogwarts houses. (Source: Google+), (no seriously Google+)
The fungus, now a subclass of its own - radiotrophic - convert, specifically gamma, radiation using the melanin pigment.
Experiments showed that samples exposed to gamma radiation experienced acetate accumulation and biomass growth up to 4 times faster than those without exposure.
It is currently not clear if they use the same process as phototrophic organisms (photosynthesis.)