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首页> 外文期刊>The Lichenologist >Molecular phylogeny resolves a taxonomic misunderstanding and places Geisleria close to Absconditella s. str. (Ostropales: Stictidaceae)
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Molecular phylogeny resolves a taxonomic misunderstanding and places Geisleria close to Absconditella s. str. (Ostropales: Stictidaceae)

机译：分子系统发育学解决了一个分类学上的误解，使Geisleria靠近Absconditella s。海峡（骨trop科）

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摘要

The phylogenetic position of the genus Geisleria and its type species G. sychnogonioides was reconstructed using sequence data of the mitochondrial small subunit (mtSSU), the nuclear large subunit rDNA (nuLSU) and the first subunit of the RNA polymerase (RPB1). The species, previously classified in Verrucariaceae (Eurotiomycetes) and Strigulaceae (Dothideomycetes), is sister to the type of the genus Absconditella, A. sphagnorum, and nested within the genera Absconditella and Cryptodiscus combined (which also includes the lichenized Bryophagus). At first glance it appears to be a further example of parallel evolution of perithecioid ascomata within Stictidaceae (Lecanoromy-cetes: Ostropales), besides Ostropa and Robergea, adding to the growing list of perithecioid forms nested within apothecioid lineages in Ostropomycetidae, and specifically Ostropales, with other examples known from Graphidaceae (several genera), Gyalectaceae {Belonia), and Porinaceae. However, revision of type material collected by Nitschke revealed that the species actually develops typical apothecia with a narrowly exposed disc. We conclude that Geisleria sychnogonoides was erroneously considered a pyrenocarpous taxon, because in dry conditions the apothecia are closed and notrecognizable as such. The species usually grows on unstable soil and therefore often only develops yoing, more or less closed ascomata (yet with mature ascospores), and has also been confused witty the superficially similar Belonia incarnata, in which the ascomata remain closed even when majjure. Geisleria sychnogonioides has so far only been known as a rarely reported pioneer species from ldamy soils in Europe and North America. Here it is reported to occur abundantly on lateritic sils in subtropical Brazil, suggesting that it is cosmopolitan and possibly common, but much overlooked.
机译：使用线粒体小亚基（mtSSU），核大亚基rDNA（nuLSU）和RNA聚合酶（RPB1）的第一个亚基的序列数据，重建了盖氏菌属及其类型种G.sychnogonioides的系统发育位置。该物种先前被分类为疣形纲科（Eurotiomycetes）和伞形科（Dothideomycetes），是Absconditella，A.sphagnorum属的姊妹种，并嵌套在Absconditella和Cryptodiscus属（还包括苔藓化的苔藓）中。乍一看，这似乎是一个进一步的例子，表明除了棘皮动物和罗伯加之外，棘皮动物科中棘皮动物的子囊（Lecanoromy-cetes：Ostropales）平行进化，这增加了嵌套在棘皮动物科（尤其是ostropales）的类棘皮动物谱系中的类皮动物形式的增长清单，以及从Graphidaceae（几个属），Gyalectaceae（Belonia）和Porinaceae已知的其他实例。然而，对尼奇克收集的典型材料的修改显示，该物种实际上发展出典型的萎缩症，椎间盘狭窄暴露。我们得出的结论是，Geisleria sychnogonoides被错误地认为是异果皮分类单元，因为在干燥条件下，紫杉属植物是密闭的，因此无法识别。该物种通常生长在不稳定的土壤上，因此通常只发展成年幼的，或多或少闭合的子囊（但有成熟的子囊孢子），并且也被表面相似的Belonia incarnata弄糊涂了，即使在天真时，子囊仍保持闭合。迄今为止，在欧洲和北美洲的泥泞土壤中，鼠尾草（Geisleria sychnogonioides）仅是鲜为人知的先锋物种。据报道，它在亚热带巴西的红土层上大量存在，表明它是世界性的，可能很普遍，但是却被忽略了。

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