Tuber melanosporum, called the black truffle, Périgord truffle or French black truffle, is a species of truffle native to Southern Europe. It is one of the most expensive edible mushrooms in the world.
The round, dark brown fruiting bodies (ascocarps) have a black-brown skin with small pyramidal cusps. They have a strong, aromatic smell and normally reach a size of up to 10 cm (3.9 in). Some may be significantly larger, such as a black truffle found 2012 in Dordogne with a mass of 1.277 kg (2.82 lb).
Their flesh is initially white, then dark. It is permeated by white veins which turn brown with age. The spores are elliptical and measure about 22–55 µm by 20–35 µm. They are dark brown and covered with large spikes.