Assertion: truffle | /r/PartOf | the genus tuber
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Source sentences:
text: Taxonomically, truffles are ascomycetes fungi belonging to the genus Tuber, the family Tuberaceae, and the order Pezizales  and are distributed in six pezizalean families: Glaziellaceae, Discinaceae, Morchellaceae, Helvellaceae, Tuberaceae, Pezizaceae, and Pyronemataceae .