I'm not lichen it so rad

http://kiikochan.blog136.fc2.com/blog-entry-1556.html
A blogger's summary of a TV report (Feb 24, 2012): Black lichens of 1,000,000 becqerel/kg. They have these at Chernobyl, too. It seems to get energy from radiation.
If you google the term 黒い物質 (black substance) it tends to come up.