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Il tartufo bianco è una prelibatezza rara e costosa. Durante l'ultima asta mondiale di Alba, tenutasi lo scorso autunno, un tartufo bianco da 880 grammi era stato battuto per 85'000 euro. Al nord delle Allpi i cani addestrati avevano sempre trovato solo il meno pregiato tartufo nero, dalla comunque non indifferente quotazione di circa settecento franchi al chilo.
Nel 2012 è però stata fatta una clamorosa scoperta. Il cane Giano trovò del tartufo bianco in un parco cittadino di Ginevra. Molti pensarono a un caso unico, altri credevano in uno scherzo. Gli specialisti dell'istituto federale di ricerca per la foresta, la neve e il paesaggio, dopo anni di ricerche, sono giunti a una conclusione: in quel parco ginevrino il tartufo cresce regolarmente.
La presenza del prezioso tartufo a nord delle Alpi è dunque stata scientificamente provata.
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