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Tuber aestivum, commonly known as the Summer Truffle, is a hypogeous (underground) ascomycete fungus belonging to the family Tuberaceae. Morphologically, the fruit body (ascocarp) is roughly spherical to irregular in shape, typically ranging from 2 to 10 cm in diameter. The peridium (outer skin) is black and covered in prominent, coarse, pyramidal warts (verrucae) that are 3-9 mm across. Internally, the gleba (flesh) is initially whitish and firm, maturing to a hazel or yellowish-brown color, distinctively marbled with a network of thin, branching white veins (venation) that do not change color when exposed to air. Unlike the darker Tuber melanosporum, the gleba of T. aestivum remains lighter even at full maturity. Ecologically, T. aestivum is an obligate ectomycorrhizal fungus, forming symbiotic relationships primarily with the roots of angiosperms such as Quercus (oak), Corylus (hazel), Fagus (beech), and occasionally Pinus (pine). It thrives in open woodlands and requires calcareous soils with high pH levels. Molecular phylogenetic studies (notably by Paolocci et al., 2004) have strongly indicated that the Burgundy Truffle (Tuber uncinatum) is genetically conspecific with T. aestivum, representing an autumn-fruiting ecological variety rather than a distinct species, though they are often marketed separately due to seasonal differences in aroma intensity.
Native: Western Europe, Central Europe, Southern Europe, Parts of Northern Africa, Western Asia. Introduced: New Zealand, Australia, United States (Pacific Northwest and Southeast in managed orchards). One of the most widespread truffle species in Europe, found from Spain to Sweden and the UK to Turkey. Commercially harvested from the wild and increasingly cultivated in managed truffières.
No strains cataloged yet for this species.
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