"For nearly a century and a half, scientists have debated the fossilized remains of an organism originally believed to have been an ancient evergreen and since suggested to have been an oversize alga, fungus or lichen. Now a team has concluded that the bizarre life form, which was the largest known organism on land in its day, was in fact a humongous fungus."
http://www.telegraph.co.uk/news/main.jh ... ush124.xml (http://www.telegraph.co.uk/news/main.jhtml?xml=/news/2007/04/24/wmush124.xml)