The invasive golden oyster mushroom is spreading through North America, threatening native species and biodiversity. And with temperatures warming, further expansion could lead to dire ecological consequences.
The golden oyster was brought to the U.S. from Asia during the 2000s mostly because it “can grow quickly” and is considered one of the “most delicious mushrooms a forager can find,” said Vice. The bright yellow mushroom’s ability to reproduce quickly has caused it to spread across the continent. It has already been found in 25 U.S. states.
The fungus is “invisible for most of the year, living as mycelium, fungal strands within the wood,” said the BBC. In the spring, it “sends out its fruiting body,” which is “what we would recognize as the mushroom itself.” The mushrooms chew through hardwood, crowding out other fungus species as well as small animals and tree seedlings. Though the golden oyster “isn’t yet posing a significant risk to Western forests, it’s taking hold in the Northeast and Midwest,” said The Cool Down.
Human trade and climate change are the two factors most responsible for the mushroom's spread. “It’s a problem created by the way we use, grow and transport fungi, but acting rapidly could save vulnerable fungi from decline or extinction,” said the BBC.
“Continued research, management efforts anchored in social theory and collaborative conversations about microbial endemism” will be necessary, said a 2025 study published in the journal Current Biology. The “cultivation of local species or development of sporeless mushroom strains could also mitigate risks.”
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