Is the golden oyster mushroom the salvation for pharmaceuticals?

By Dr. Tim Sandle

SCIENCE EDITOR

DIGITAL JOURNAL

April 24, 2026


Traditionally, Paris button mushrooms are grown in former quarries, with ground limestone added to the compost - Copyright AFP/File ISAAC LAWRENCE

The golden oyster mushroom (Pleurotus citrinopileatus) may be a culinary hit in certain parts of the U.S. (notably Florida). However, it is becoming an ecological problem.

With its bright yellow, cushion-like caps, the golden oyster mushroom has become a favourite among home growers and food lovers. It is widely available in grow-your-own kits and sold in grocery stores, farmers markets, and specialty shops.

Scientists warn that the fungus is spreading quickly through U.S. forests, where it outcompetes native fungi and reduces biodiversity. For instance, in just a decade, the organism has appeared in more than 25 states, largely due to human cultivation and transport. The fungus’s silent expansion is now raising concerns about long-term impacts on forest ecosystems.

Like other oyster mushrooms, the species is a wood-decay fungus. In the wild, it most commonly decays hardwoods such as elm.

Michelle Jusino, assistant professor of forest pathology at the School of Forest, Fisheries, and Geomatic Sciences at the Institute of Food and Agricultural Sciences (UF/IFAS), suggests that growing this species comes with important factors. While it is prized in the kitchen, it may not remain contained once introduced outdoors.

She says: “The golden oyster mushroom may look harmless on a log, but it appears to be a strong competitor in the forest. It is associated with changes in the fungal community, reducing biodiversity and potentially affecting processes like wood decomposition and carbon cycling.”

Impact of human activity

The research highlights how everyday human activities, including purchasing, cultivating, and transporting mushrooms, can unintentionally introduce invasive species into new environments. To track the spread, Jusino utilized community science platforms such as iNaturalist and Mushroom Observer. These records allowed them to map sightings of the golden oyster mushroom across North America.

The findings revealed that across ten years, the species has expanded into more than 25 U.S. states, including Texas, District of Colombia, Virginia, North Carolina, Alabama, and Louisiana. Earlier research by Andrea Bruce suggests the mushroom first entered the wild in the United States in the early 2010s.

In context

“It is slowly marching south, which is really terrifying,” interprets Jusino. “In 2016, the mushroom was found growing in the wild in just five states, all in the Midwest and Northeast, but today I think fewer than 10 states east of the Mississippi river remain without records of golden oyster in the wild.”

Jusino and her colleagues studied dead elm trees both with and without golden oyster mushrooms. They collected wood samples from different heights on each tree and used DNA-based methods to identify the fungi present.

These findings revealed clear differences. Trees colonized by golden oyster mushrooms contained far fewer fungal species, and the overall mix of fungi was altered compared to unaffected trees. Some native fungi, including those with ecological or medicinal importance, were reduced, while only a small number of species seemed able to coexist with the invasive mushroom.

Preventive action

Jusino emphasises that preventing further spread requires increased awareness, careful monitoring, and a preference for using native mushroom species. Jusino is also continuing to test new methods to better understand and manage the issue.

Given that reports of golden oyster mushrooms continue to grow, scientists stress that even edible fungi can have wide-ranging ecological effects. Protecting native fungal biodiversity is critical for maintaining healthy forests and preserving the genetic diversity needed to adapt to climate change.

Although it is an attractive and edible species, the golden oyster mushroom has demonstrated its ability to escape cultivation and establish itself in the wild, where it can outcompete native fungi.

Ecological impact

Microbial invasions often receive far less attention than invasive plants, insects, or animals, yet they can significantly alter ecosystems. Fungi and bacteria may spread unnoticed while reshaping the balance of life in forests.

“Invasive fungi are part of the biodiversity crisis,” Jusino adds, putting the findings in context. “They’re small, but their impact can be enormous. Paying attention now gives us a chance to protect native ecosystems before the balance tips too far.”

Research paperr

The findings, to support these extra-terrestrial findings, appear in the journal Current Biology, titled: “Invasive golden oyster mushrooms are disrupting native fungal communities as they spread throughout North America”.