The Tuberaceae are a family of mycorrhizal fungi, in the order Pezizales, that evolved during or after the first major adaptive radiation of Angiosperms in the Jurassic period. It includes the genus Tuber, which includes the so-called "true" truffles. It was characterized by the Belgian botanist Barthélemy Charles Joseph du Mortier in 1822. A molecular study of ribosomal DNA by mycologist Kerry O'Donnell in 1997 found that a small clade now redefined as Helvellaceae is most closely related to the Tuberaceae. The mycologist Mary Cloyd Burnley Stifler studied and described this fungal family, donating specimens to herbariums across the United States.
Pecan truffles, a prized edible fungus that grows underground near pecan tree roots, don't spread evenly through an orchard. A new study found truffle DNA levels varied by over 50,000-fold between different sections of the same orchard, with younger trees surprisingly hosting the most truffle growth.