What changed
Researchers led by Yu Fuqiang at the Kunming Institute of Botany, Chinese Academy of Sciences, have identified Dianjunus rex, a previously undescribed fungus, and established a new family for it: Dianjunaceae.
The fungus grows from the roots and surrounding soil of recently dead trees in Yunnan forests. Its fruiting structures reach 20 to 50 centimetres, and one specimen weighed 2.2 kilograms, making it the largest recorded fruiting structure in the fungal phylum Ascomycota.
Why it matters
This is not just a large mushroom with a dramatic name. It redraws the known shape of a major fungal lineage. Dianjunus rex is the only reported member of its family, and its discovery shows how much biological diversity can remain hidden even in a region where more than 6,000 fungal species have already been recorded.
The name links Yunnan’s ancient Dian kingdom with the Latin rex, or “king,” echoing Tyrannosaurus rex. The comparison is more than branding: researchers estimate that the family diverged around 65 million years ago, after the mass extinction that ended the dinosaur era. They propose that it may have occupied newly available forest niches as ecosystems recovered, though that evolutionary explanation remains an inference.
The bigger point is the gap between what has been catalogued and what may exist. Yunnan’s total fungal diversity could exceed 100,000 species, according to the researchers. This discovery puts a two-kilogram marker on that uncertainty: sometimes an entirely new branch of life is not microscopic or obscure, but standing upright beside a dead tree.
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