Tuber aestivum

Hypogeous species associated with all kinds of trees, with a preference for calcareous soils, spherical to subspherical in shape, 3 to 10 cm in diameter, surface very irregular with coarse pyramidal warts, very dark brown to black, with a labyrinthine gleba bearing numerous whitish to brownish veins.

Outer peridial tissue pseudoparenchymatous, with globose to angular hyphae, thick-walled, and with abundant brown pigment inside.

Asci subglobose, 50 to 100 µm in length, 45 to 70 µm in width, containing 1 to 6 spores inside.

Ascospores subglobose to ellipsoid, with ridges 3 to 5 µm high, pale yellowish-brown under the microscope, 25 to 40 µm in length excluding ornamentation, 16 to 25 µm in width, and ornamented with a coarse and irregular reticulum with 3 to 5 meshes across.