amur is meant is a honey mushroom (Armillaria solidipes) that grows in the region of Blue Montains, Oregon, United States. This fungus covers an area of 965 hectares or about 1665 times the area of football field. The largest mushroom was discovered in 1998.
Not only the size, the age of this fungus is also very fantastic. Based on its growth rate until now, it is estimated that this mushroom is 2,400 years old.