Researchers from the Kunming Institute of Botany discovered an unusually large fungus while surveying forest environments in Yunnan, China. The team encountered distinctive whitish reproductive structures emerging from the roots of Chinese cork oak trees in temperate coniferous forests and tropical rainforest settings. Through genetic analysis and laboratory cultivation, scientists determined the discovery represented a previously unknown genus and family within the fungal order Xylariales, which they named Dianjunus rex and designated the family Dianjunaceae.
The reproductive structures, or stromata, of Dianjunus rex can reach 50 centimeters in height and weigh up to 2.2 kilograms, making them the largest known fruiting bodies among ascomycete fungi. The previous record for ascomycete fruiting body height was approximately 20 to 30 centimeters. Researchers hypothesize that the fungus’s exceptional size may provide an advantage in spore dispersal within dense forest environments, though such growth requires substantial energy investment.
Molecular clock analysis comparing the fungus’s DNA with hundreds of other fungi suggested the Dianjunaceae family originated approximately 65 million years ago, roughly one million years following the Cretaceous-Paleogene mass extinction that eliminated non-avian dinosaurs. Scientists propose that dramatic environmental changes after this extinction event, including the abundance of dead plant material, may have created favorable ecological conditions for the ancestors of this unusual fungus.
The discovery underscores the extent of undiscovered fungal diversity in East Asian forests. Researchers note that Yunnan’s varied habitats, stable climate, and complex biotic interactions support fungal diversification, yet many species remain scientifically unexamined. Logistical challenges in field sampling, the seasonal and hidden nature of fungal fruiting structures, and historical research emphasis on economically valuable fungi have contributed to underestimation of fungal diversity in these ecosystems. Continued exploration is expected to reveal additional species and evolutionary histories.
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