The black Extra Quality truffle (tuber uncinatum) is the most known and commonly appreciated truffle in the world. The most basic reason these are the most common is because of their ability to adapt to different land enviornments. Usually during the winter and spring months, between December to March.

The major differences between the 1st Grade truffle and the Extra Quality is the shape. Extra Quality truffles tend to have a nicer appearance than the 1st Grade.