ABSTRACT Truffles in the genus Tuber are hypogeus fungi that have a worldwide distribution. Despite this, knowledge about their diversity in the Middle East is very limited. In recent years, large quantities of truffles have been imported from Iran for being sold in Italy. While analyzing certain commercial batches of T. aestivum from Iran, we found some ascomata that resembled T. excavatum but had macro- and micromorphological features that were distinct from this species. They were subglobose, or depressed to slightly irregular, with a conspicuous basal cavity, grayish brown, brown, or pinkish gray, with a minutely papillose peridium. The gleba was pinkish gray in youth, brown at maturity, marbled with cream branched veins. Ascospores were broadly ellipsoid, with an irregular reticulum and distinctive long crests along the longitudinal axis, up to 9 µm high. Analysis of internal transcribed spacer (ITS) and large subunit (LSU) rDNA sequences showed that these specimens form a monphyletic and well-supported taxon within the Excavatum clade. Morphological and molecular analyses supported the proposal of the new species T. iranicum.

中文翻译：

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伊朗块茎，sp。11 月，属于 Excavatum 进化枝的松露物种

摘要块茎属中的松露是世界范围内分布的假真菌。尽管如此，关于他们在中东的多样性的知识非常有限。近年来，大量松露从伊朗进口，在意大利销售。在分析来自伊朗的某些商业批次的 T. aestivum 时，我们发现了一些与 T. excavatum 相似但具有不同于该物种的宏观和微观形态特征的子囊虫。它们呈近球形，或凹陷至略不规则，具有明显的基腔，灰棕色、棕色或粉灰色，具微小的乳突状包膜。gleba 年轻时呈粉灰色，成熟时为棕色，带有奶油色的分枝静脉。子囊孢子呈宽椭圆形，具有不规则的网状结构和沿纵轴的独特长冠，高达 9 µm。对内部转录间隔区 (ITS) 和大亚基 (LSU) rDNA 序列的分析表明，这些标本在 Excavatum 进化枝内形成了一个单系且支持良好的分类群。形态学和分子分析支持新物种 T. iranicum 的提议。