Did You Know: Fungus Is the Largest Living Organism in the World


In the Malheur National Forest in Oregon, USA, the fungus Armillaria ostoyae covers over 2,200 acres (890 hectares). With an estimated age of about 2,400 years, it is the largest living thing and one of the oldest.

The fungus, a variety of honey mushrooms, spreads through an underground web of mycelial structures resembling threads. These mycelia can extend for miles and link up different mushroom fruiting bodies to create a single organism.


It is truly amazing how long this fungus can live and how quickly it can spread. The mycelia can infect and kill trees by utilising the nutrients from the infected trees to feed the fungus’ growth. Mycelia can communicate and work together to grow and survive.

However, not all fungi are dangerous. It is a crucial part of the ecosystem, breaking down decaying plant matter and adding nutrients back into the soil. It is a valuable food source for bears, insects, and other wildlife.

The fungus is comparatively unknown to the general public despite its size and age. A graduate student researching forest decline found it in the late 1970s. It serves as a reminder that there is still a great deal we don’t understand about our environment and the variety of living things that inhabit it.

The discovery of the Armillaria ostoyae fungus, an incredibly rare and fascinating organism, reminds us of the enormous and uncharted diversity of life on our planet. It is a true miracle of nature and evidence of how adaptable and resilient life is on Earth.

Another intriguing fact is that this fungus is the largest living thing and one of the most widespread. North America, Europe, and Asia forests are home to the Armillaria ostoyae species. The fungus has likely been changing and evolving for millions of years based on its capacity to adapt to different environments and climatic conditions.

This fungus differs from other organisms in that it can reproduce both sexually and asexually. Both its underground mycelia and spores, which the wind or animals can disperse, can be used for reproduction. The fungus can quickly spread and colonise new areas as a result.


One intriguing study discovered that the fungus’s mycelia can create an underground “network.” Mycelia of fruiting bodies can communicate, share resources and work together to infect new trees. This distinguishing characteristic, which has never been seen in any other fungus, emphasises the sophistication and complexity of the living thing.

One of the most fascinating creatures in the world is the fungus Armillaria ostoyae, which covers more than 2,200 acres in Oregon. The largest known organism on the planet, it is thought to be about 2,400 years old. It is also one of the most common and flexible organisms, capable of both sexual and asexual reproduction as well as communication with other mycelia. The vast and uncharted diversity of life on our planet is a crucial reminder.



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