Researchers identify a giant new fungus in China’s Yunnan forests

Scientists working in China have described a massive new fungus from the forests of Yunnan, identifying Dianjunus rex as a previously unknown species and, according to the report, the largest known member of the fungal group Ascomycota. The finding was published in Frontiers in Fungal Biology after genetic work by researchers from the Kunming Institute of Botany and collaborators.

A giant fungus with a new name

The fungus has pale yellow, fingerlike structures that can grow to about 20 inches tall and weigh nearly 5 pounds. Those measurements helped researchers recognize it as something far beyond an ordinary forest mushroom, even though local people had already noticed it before the scientific identification.

According to the source, a resident sent photos to the researchers, prompting closer study. That work led scientists to conclude that the organism was not just a new species, but the only known member of a newly established family, Dianjunaceae.

• Name: Dianjunus rex
• Location: Yunnan, China
• Group: Ascomycota
• Size: Up to 20 inches tall and nearly 5 pounds
• Taxonomy: New family, Dianjunaceae

What the genetics suggest

The report says genetic analysis points to an origin about a million years after the asteroid impact that ended the dinosaurs. That timing places the fungus in a much older ecological story, one shaped by the aftermath of a global extinction event.

Researchers describe the fungus as a decomposer that would have lived in a landscape filled with dead plant and animal material. In that sense, the species may help scientists better understand how fungi adapted to post-dinosaur ecosystems and spread through forests over very long periods of time.

Why the discovery matters

The discovery adds to evidence that much of the fungal world remains unknown. The source says the find highlights how much fungal diversity scientists still have not documented, even in places that people have long explored.

For ordinary readers, the story is a reminder that some of the largest and most unusual life forms can remain hidden in plain sight. A fungus that locals had seen before turned out to be not only new to science, but also significant enough to require a new family name. That makes Dianjunus rex more than a curiosity; it is a sign that forests may still hold many undiscovered species and surprises.

Source: Arden Dier