Black winter truffle
The Black Périgord Truffle has a rounded appearance and is quite homogeneous. The peridium or rind has protrusions and warts that make it very rough to the touch and it has a brownish or blackish colour. Specimens that are not perfectly ripe may be also reddish. The gleba, or inner part of that fungus, is black-violet with whitish veins.
The size may vary significantly and can range from that of a hazelnut (the most common) to that of a large apple (the rarest), reaching even one kilogram in weight in the biggest specimens.