The most massive of all discovered at this point fungi growing on a tree in China.
The fungus is 10 meters long, 80 centimeters wide and weighs half a ton.
He broke the record of the previous record holder of Kew Gardens in the UK.
Giant mushrooms are at least 20 years.
For the first time this type of fungus was discovered in 2008 in Fujian Province, China, by Professor Yu-Cheng Dai of the Chinese Academy of Sciences, and his assistant, Dr. Kew.
"But those mushrooms were not so huge," - said Professor Tai.
"We found a giant mushroom in Hainan Province in 2010," - he explained.
The researchers studied fungi corrosive trees when suddenly stumbled upon this instance, which was described by them in the journal Fungal Biology.
"We are not looking for it specifically and did not suspect that the fungus can be so great," - he said.
"We were extremely surprised to find it and at first did not even realize that it is a fungus, due to its large size."
The fungus F. ellipsoidea, belongs to the species, which is known under the name of mycologists bracket fungus.
Being a perennial, it can live for many years, allowing it to grow to such epic proportions.
Colonizing the crown of large fallen trees, the fungus has access to a large number of dead and decaying wood for its energy needs.
Fruiting body of the fungus is a body of the highest forms of reproduction of many fungal spores are produced and distributed, of which there will be future generations of mushrooms.
Fruiting body of a giant fungus F. ellipsoidea reaches a length of 10.85 meters, width of 82-88 inches and thickness 4.6-5.5 centimeters.
Tests to determine the density of the fruiting body suggest that his weight is 400-500 pounds. Scientists estimate that it contains about 450 million spores.
"The size of the fungus is much larger than a man" - said Professor Dai.
The previous record belongs Rigidoporus ulmarius, tinder with columnar fruiting body, which was discovered in Kew Gardens in the UK in 2003.
Its diameter reached about 150 centimeters and the length of the circumference of cap 425 centimeters.
After the discovery of the fungus-record holder, the researchers took his samples to laboratories for analysis.
Tests have shown that the fungus belongs to the species Fomitiporia ellipsoidea. Scientists have made two more expeditions for more detailed study.