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The yellow mushroom known as golden oyster was imported from Asia for food cultivation in the United States in the early 2000s, escaped around 2010, and is now reproducing aggressively in 25 states, outcompeting native fungi and reducing biodiversity in the hardwood forests of the northeastern and midwestern United States
A bright yellow mushroom that grows in large clusters on dead tree trunks is becoming one of the most concerning invasive species in the United States. The golden oyster mushroom, native to Asia, was imported to the country in the early 2000s to be cultivated as food. Around 2010, it escaped from cultivation farms and began to reproduce aggressively in American forests. By 2025, it had already been identified in 25 states and one Canadian province, according to a study published in the journal Current Biology.
According to a study by Current Biology, the problem is not just the speed at which this yellow mushroom spreads, but what it does along the way. The fungus outcompetes native mushrooms for resources, reducing fungal biodiversity in the forests where it establishes. The Oregon Mycological Society has issued a warning about the risks of the species, and researchers fear that climate change will expand the invader’s range to regions that have not yet been affected, including the Pacific Northwest.
How the yellow mushroom escaped cultivation and invaded American forests
The story of this yellow mushroom in the United States begins like that of many invasive species: with an apparently harmless import. The golden oyster mushroom was brought from Asia to be cultivated on food production farms, a common practice with edible mushroom varieties.
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The problem began when spores of the yellow mushroom escaped from the controlled cultivation conditions and found in American forests an ideal environment to reproduce unchecked.
The escape occurred around 2010, and from there the spread was rapid. The fungus primarily feeds on dead hardwood trees, especially elms, which are abundant in the eastern half of the United States.
In just over a decade, the yellow mushroom has been identified in 25 American states and one Canadian province, with over 12,500 records in the iNaturalist app, a platform where users submit photos of species found in nature.
What the yellow mushroom does to native fungi along its path
The golden oyster mushroom grows rapidly and in large quantities, characteristics that give it a competitive advantage over native species occupying the same ecological niche.
As the yellow mushroom establishes itself in an area, it outcompetes local fungi in the competition for logs and decomposing organic matter, progressively reducing the fungal diversity of the forest.
This impact is especially concerning because fungi play essential roles in forest ecosystems, from decomposing organic matter to forming mycorrhizal networks that connect tree roots.
Researchers of the study published in Current Biology warn that the impacts of non-pathogenic invasive microbes are poorly documented, making it even more difficult to predict the long-term consequences of the spread of this yellow mushroom through the forests of the United States.
Climate change may expand the range of the invasive yellow mushroom
So far, the yellow mushroom is primarily concentrated in the hardwood forests of the northeastern and midwestern United States. The Pacific Northwest, dominated by conifers, has not yet recorded a significant presence of the species.
But researchers fear that global warming will make more regions hospitable to the invasive fungus, expanding its range to territories that are currently climatically unfavorable.
Even in conifer-dominated regions, the yellow mushroom may find niches in urban areas, where there is greater diversity of hardwood species, including elms planted in parks and streets. Recent identifications on iNaturalist show that the fungus has already appeared in Seattle, Boise, and possibly Portland, signaling that the expansion westward may be starting.
Mycologist Aishwarya Veerabahu, co-author of the 2025 study, assessed that the identification in Portland is likely legitimate, based on the appearance and growth pattern recorded in the photo.
What foragers and cultivators can do to contain the invasion
The Oregon Mycological Society has issued practical guidelines for those who encounter the yellow mushroom in nature. The main recommendation is to harvest specimens before they mature and release spores, and transport them in a tightly sealed plastic bag or container that prevents dispersion.
Any unprotected contact with the fruiting fungus can contribute to unintentional spread.
For mushroom cultivators, the warning is even more direct. Joe Cohen from the Oregon Mycological Society warned that cultivating exotic species without strict containment protocols can repeat the same mistakes that allowed the escape of the golden oyster mushroom.
If mycophagy continues to grow in popularity, other exotic species cultivated for food may also escape and become invasive, replicating the pattern that has already caused measurable damage in American forests.
Why invasive fungi are more dangerous than they seem
When it comes to invasive species, attention often focuses on plants and animals. Invasive fungi receive much less attention from science and the media, meaning their impacts are discovered too late and control mechanisms arrive after the damage is already done.
The case of the golden oyster mushroom is a clear example: it took over a decade between the escape from cultivation and the publication of the first comprehensive scientific study on its impacts.
Fungi are the invisible foundation of forest ecosystems. They decompose organic matter, recycle nutrients, and form underground networks that connect trees to one another. When an invasive yellow mushroom like the golden oyster dominates a forest, it not only replaces native species but can alter the entire ecological dynamics of the environment.
That is why researchers insist that fungal biodiversity deserves the same attention we dedicate to threatened plants and animals.
An invader that most people would not recognize on the trail
The golden oyster mushroom is beautiful, edible, and seems harmless growing on a dead log. But it is an aggressive invasive species that has already spread to 25 American states, destroying native fungal communities and reducing biodiversity in the forests where it establishes.
The story serves as a warning for any country that imports exotic species for food cultivation without strict biological containment protocols.
Did you know that a mushroom can be an invasive species? Do you think Brazil should be concerned about this type of threat, or is the problem exclusive to the United States? Leave your comments and share this article with those interested in ecology and biodiversity.
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