But more interesting is that gamma rays aren't common in nature (are they?), so natural selection wouldn't be the cause of it, unless the fungus lived in a radioactive ambient.
Only emitted by certain radioactive elements and in nuclear reactions; significant gamma sources include the sun (most of which is blocked out by the atmosphere, etc) and underground uranium deposits; maybe this melanin-rich fungus evolved underground to effectively "feed on" uranium?
I'm also fairly sure melanin is the tanning pigment in humans; it says it's the same type of melanin, so maybe humans could metabolise gamma rays a little bit, too. Y'know, right before the radiation kills them.
I have a hard time believing some of these articles unless theres other sources to back it up, it all reminds me of like Coast to Coast and Art Bell stuff; lol... (No I'm not saying this particular thing isn't true or anything; lol I just like to cite my sources )
I've read about this elsewhere, in some quite credible sources, but this was the first thing that showed up when I googled it.