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This paper adds new insights on ecology and micromorphology of Tuber melosporum, a rare species with smooth spores. Eight T. melosporumascomata collected in a 50 y old Pinus halepensisand Quercus ilexplantation in Sardinia, Italy, represent the first recovery of this species outside Spain. In comparison to the T. melosporumholotype, Italian specimens revealed differences in the number of spores in asci and spore shape. We propose an emended description of Tuberto include species without spore ornamentation.