Black summer truffles (Tuber aestivum (Wulfen) Spreng.) ripen from spring to the end of summer. However, there are also later varieties that ripen until mid-winter, which we call dark summer truffles or uncut truffles (Tuber aestivum var. uncinatum). The summer truffle is widespread throughout Europe, and occurs in the north from Sweden, all the way to North Africa, at altitudes of 50 – 1400 m. They create mycorrhizae with oaks, beeches, chestnuts, hazels, hornbeams, lindens, pines and hemlocks. The summer truffle occurs naturally in 26 of the 27 countries of the European Union (except Finland). Outside of Europe, it occurs in Morocco and Turkey. Unlike the black truffle, the summer truffle is less thermophilic, requires more water and adapts to different types of soil: from sandy to clayey, calcareous and less calcareous, more or less humus.