A photo of a giant mushroom eclipsing a group of people allegedly shows the largest living thing in the world. Are the photo and the accompanying story real or a hoax?
The story is real but the photo is fake.
The Story: Real
As first reported all the way back in August of 2000, the world’s “largest living thing” is indeed the honey mushroom (Armillaria ostoyae) of Oregon. It covers 2200 acres and is estimated to be over 2400 years old. A paragraph from the story linked above has been circulating online for years, which is in fact accurate. It includes, however, a fake photo of a single, giant mushroom that completely misrepresents the story and the honey mushroom. The story included with the photo is:
Oregon’s monster mushroom is world’s biggest living thing
The largest living organism ever found has been discovered in an ancient American forest. The Armillaria ostoyae, popularly known as the honey mushroom, started from a single spore too small to see without a microscope. It has been spreading its black shoestring filaments, called rhizomorphs, through the forest for an estimated 2,400 years, killing trees as it grows.
The Photo (Click photo at right for larger version)
The caption being circulated fails to mention that the fungus is not a single, massive growth, but covers many square miles of land. The giant mushroom depicted in the photo is a digital creation, and does not show the honey mushroom of Oregon.
The first step we took in debunking this photo was to look closely for obvious signs of manipulation. The person in the red shirt, for example, appears to be using binoculars – which wouldn’t be necessary for an object only about 20-feet high. The edges of the mushroom indicate that a photo of a mushroom was cut out and enlarged (see below). It would also stand to reason that if such a massive mushroom did exist, there would be more photos of it. Such an amazing sight would have been well-documented by scientists and journalists, yet the photo above is the only image in existence of this large mushroom.
The massive mushroom in the fake photo doesn’t even appear to depict the honey mushroom of Oregon. Take a look at the actual honey mushroom (right) and compare it to the one in the manipulated photo above.
According to the website by Tom Volk, Professor of Biology at University of Wisconsin-La Crosse, “The largest fungal fruiting bodies known are… only about 300lbs.”
There are several signs of digital manipulation of the image. Take, for example, how the edges of the stem change when background changes to the forest behind it. The edge changes from a smooth, slightly blurry line to a very sharp edge. This indicates that the image of the mushroom was likely cut out and placed there. See the enlargement below.
True source of the image – “Boletus photoshopus”
Though we felt our “edge analysis” was enough to debunk the hoax, we decided to dig a little deeper and ask around to see if any “mushroom experts” could tell us anything else about the image. We first contacted Professor Volk to see if he had any insights, and he was in fact familiar with the image. His response was:
“This picture was out of Tom Bruns’ lab at Berkeley. Definitely photoshopped. Apparently believably. Hope this helps. —tom”
Next up was an email to Tom Bruns at UC Berkeley, who responded immediately. His quirky response included the subject of Boletus photoshopus with a single statement:
Pictured in its natural habitat – the digital photo. – Tom Bruns
In other words, the “natural habitat” of the mushroom in the image is in a digital photo. We love the name he gave the mushroom in the picture: Boletus photoshopus.
We’d like to thank Thomas Volk and Tom Bruns for helping us debunk the image once and for all. Who knew that fungi experts could be so cool?