Swiss scientists have found what they say may be Europe's biggest mushroom - covering an area about the size of 35 football pitches. The fungus was discovered in a national park near the eastern town of Ofenpass, said the Federal Institute for Forest, Snow and Countryside Research (WSL). Spanning 35 hectares (86 acres), the mostly underground fungus is believed to be 1,000 years old, the WSL added. The Honey Mushroom (Armillaria ostoyae) is edible, but it can kill trees. "The majority of the fungus is an underground network that looks a bit like shoelaces," WSL's spokeswoman Muriel Bendel said. "The...