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The Fine Black Truffle of Norcia is a purplish-black colour on the outside and on rare occasions has rust coloured spots. Its warts are regular shaped with polygonal surfaces, like a diamond, with a dent in the centre. The gleba, or inner part of the truffle, is very dark with white filaments that darken when in contact with the air, becoming reddish. The asci are round and contain 4-6 spores, dense with spikes, egg-shaped and yellowish-brown in colour. The fine back truffle of Norcia has a pleasant, aromatic fragrance that manifests itself fully during cooking. The trees to which it most readily becomes attached are: the Oak, the Sessile Oak, the Downy Oak and the Holm Oak.