Tuber brumale

Under broadleaf trees, especially under hazel or linden trees, with a preference for calcareous soils, colloquially known as the "winter truffle", with globose to irregular fruit bodies 3 to 7 cm in diameter, black, with a warty surface, a greyish-brown gleba with broad, widely spaced white veins, a very variable intense odor, and a sweet, pleasant flavor.

Peridial hyphae with a pseudoparenchymatous structure, composed of short, rounded hyphae with brown intracellular pigment, and context hyphae filamentous, hyaline, septate, thin- to slightly thick-walled, 4 to 6 µm wide, and irregularly interwoven.

Asci subglobose to ellipsoid, 60 to 90 µm long, 50 to 70 µm wide, and usually with 4 to 5 spores per ascus.

Ascospores ellipsoid, with spines 3 to 6 µm high, 23 to 32 µm long excluding ornamentation, 15 to 22 µm wide, and with their surface densely covered with rigid spines.

 Herbarium material available: JTP2017/23.