Common hazel, Byzantine hazel or fruit hazelnut: Which to choose in truffle tradition? It has the benefit of requiring a lot less pruning care than the common hazelnut tree, which is suckering and grows on a number of stems. Imagine that mass of cells properly organized in a compact entire that lives within the darkness of the soil, clung to the roots of a tree, to which it provides minerals and from which it receives carbohydrates as its most important supply of energy: how can truffles fulfill mankind’s primary need, current in any gene pool, that imposes the conservation and the propagation of the species?