Infact
72 / 100
Mostly True Oregon

The world's largest living organism is a fungus covering over 2,300 acres in Oregon.

Infact verdict: Mostly True (72/100).

The claims about the world's largest living organism being a fungus and its coverage of over 2,300 acres in Oregon are supported by multiple sources. The fungus, Armillaria ostoyae, is widely recognized as the largest living organism, covering approximately 2,385 acres in Oregon's Malheur National Forest. This is corroborated by sources such as Discover Magazine and the USDA. The claim is factual and well-supported by authoritative sources.

August 13, 2026 Language: en 2 claims analyzed
How is this score determined? →

Individual claims

52
Mixed Science
The world's largest living organism is a fungus.
The claim that the world's largest living organism is a fungus is supported by multiple sources, including Discover Magazine and HowStuffWorks, which identify Armillaria ostoyae as the largest organism. Although USA Today rated a related claim as 'Altered,' this was specific to images, not the factual basis of the organism's size.
Fact Check Score None
Fact Check Weight 40
Web Consensus Score 90
Web Consensus Weight 30
Source Quality Score 85
Source Quality Weight 15
Llm Reasoning Score 80
Llm Reasoning Weight 15
Llm Reasoning Score Raw 80
Weighted Total 52
Evidence Summary 3 web sources corroborate the claim.
91
True Geography
The massive fungus covers over 2,300 acres of forest in Oregon.
The claim that the fungus covers over 2,300 acres is supported by evidence from the USDA and other sources, which state that the Armillaria solidipes covers approximately 2,385 acres in Oregon. This is consistent across multiple authoritative sources.
Fact Check Score None
Fact Check Weight 0
Web Consensus Score 90
Web Consensus Weight 40
Source Quality Score 85
Source Quality Weight 20
Llm Reasoning Score 80
Llm Reasoning Weight 40
Llm Reasoning Score Raw 80
Weighted Total 91
Evidence Summary 3 web sources corroborate the claim.

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