The criteria that delineate Earth’s biggest organisms aren’t terribly scientific.
“It has, theoretically, indefinite growth potential.” Humongous Fungus has two main rivals for the title of World’s Largest Organism it may outlast both, not just because it’s resilient, but also because it is unusually well equipped to profit from this planet’s ongoing epidemic of death. “As long as you have trees, then this fungus will thrive,” says Mee-Sook Kim, a research plant pathologist at the U.S. But Humongous Fungus is also scrappy, flexible, indefatigable-a survivor-and its reach may yet keep creeping out.
The honey fungus is an unlikely candidate for such a title: It’s a microbe with an unsettling MO. Nicknamed Humongous Fungus, it is one of the planet’s largest known organisms, and the biggest ever recorded by area on land. “And so it got extremely, extremely large.” Today, that individual fungus inhabits roughly 2,400 acres of earth. “It was just extremely, extremely successful at growing,” says Adriana Romero Olivares, a mycologist at New Mexico State University. Thousands of years ago, one honey-fungus species, Armillaria ostoyae (also known as Armillaria solidipes), birthed a spore that settled in what we now think of as Oregon, started to spread, and never stopped. The honey mushroom is also an exemplar of the extreme forms that life can take. Although the bulk of the fungus’s mass is underground, its devastation is visible to anyone who’s flown over the gray, balding patches of woodland where the pathogen has felled its hosts. Orchards and vineyards have fallen to it gardeners, farmers, and foresters spend their days fruitlessly fighting the pesticide-resistant scourge. A parasite that preys on weak trees, it sucks its victims dry of nutrients, then feasts on their postmortem flesh.
Deep in the loamy soil of forests around the world, there exists a fungus called the honey mushroom that makes its living on death.
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