Chinese scientists have identified a giant new fungus named Dianjunus rex, or 'D-rex', in Yunnan, China. This remarkable species grows up to 20 inches tall and weighs nearly five pounds, making it the largest known of its kind. Its evolutionary lineage dates back roughly 65 million years, shortly after the extinction of the dinosaurs. The discovery has led to the creation of a new fungal family, Dianjunaceae, and highlights the biodiversity yet to be uncovered in East Asian forests.