Tuber macrosporum

Tuber macrosporum, commonly known as the smooth black truffle, is a species of edible truffle in the family Tuberaceae. The fungus produces blackish, irregularly shaped underground fruiting bodies measuring 2–5 cm in diameter with a grey-brown to purple-brown interior marked by thick white veins and has an intense garlic-like odour similar to the Italian white truffle. It is distinguished microscopically by its exceptionally large ellipsoid spores (measuring 40–80 × 30–60 micrometres) adorned with a distinctive mesh-like pattern. The species has a patchy distribution across Europe, where it forms beneficial relationships with various trees including oaks, hazels, hornbeams, willows, lindens, beech and poplars, preferring moist, well-aerated soils from slightly acidic to alkaline in plains and foothills....read more on Wikipedia.