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D. rex's fruiting bodies were discovered in the forests of Yunnan Province. (Song et al., Frontiers in Fungal Biology, 2026) Yunnan Province in China is famous for its mushrooms and fungi, but somehow, scientists have only just come across a new species that has rightly earned the name 'king'. Named Dianjunus rex (or D. rex for short), its gigantic, club-like fruiting bodies can grow up to 50 centimeters tall, which is about one and a half feet, or the height of a traffic cone. A researcher holds up two D. rex fruiting bodies to show off their impressive size. (Provided by Indunil Senanayake) But its impressive size is not the only exciting thing about this fungus. Its genes also contain clues about a major moment in the history of life on Earth. Mycologist Indunil Senanayake of the Chinese Academy of Sciences and her colleagues describe the new species in a paper published in Frontiers in Fungal Biology. D. rex is the only known member of its family, Dianjunaceae. "This remarkable species… provides a rare window into the evolution of extreme fungal body forms," says Senanayake.

A newly described fungus from Yunnan produces upright structures measuring up to 50 centimeters in total height. DNA and microscopic evidence support a new species, genus and family within the fungal order Xylariales. Its estimated lineage age overlaps the dinosaur extinction, but a connection between that event and its evolution remains hypothetical. Pale, fingerlike structures rising from tree roots in southwestern China have revealed an unexpected giant among fungi. Named Dianjunus rex, the newly described species produces fleshy reproductive structures reaching 50 centimeters in total height. The largest reported specimen weighed 2.2 kilograms, roughly 4.9 pounds. Its size was only the beginning of the surprise. Genetic comparisons and microscopic examinations placed the fungus on a distinct evolutionary branch, supporting a new genus and family. The findings appeared in Frontiers in Fungal Biology. The team included scientists from the Kunming Institute of Botany, Chinese Academy of Sciences, and collaborating institutions. Corresponding author Indunil C. Senanayake works at the institute’s Germplasm Bank of Wild Species.

Image: Song et. al ‘Frontiers in Fungal Biology,’ 2026 It’s a fungi-filled world and we are just living in it. There are roughly 150,000 to 157,000 known species of fungi, and now there is a new giant species to add to that tally.