Species boundaries and geographic distribution of corticioid fungi (resupinate Basidiomycota) are often poorly known. Our recent study on Subulicystidium showed that species diversity in this genus is at least twice as high as previously recognized. This re-estimation of the species diversity was based on a study of only a part of the genus. The present study sheds light on molecular and morphological diversity of three more species. We generated 27 ITS and 24 28S nuclear ribosomal DNA sequences from 49 specimens labelled as Subulicystidium cochleum, S. longisporum and S. perlongisporum and collected in distant geographic localities. We assessed pairwise dissimilarities and phylogenetic relationships of DNA sequences with Bayesian and maximum likelihood methods. We correlated phylogenetic information with morphological data on spores and cystidia. We found that the three species are not closely related, despite their similarity in spore shape and size. In one of the species, S. perlongisporum, we detected the presence of two sympatric lineages. These lineages are not morphologically distinct, except for a small difference in the mean length of cystidia. Our study provides a further example of transoceanic species distribution in Agaricomycetes.

中文翻译：

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形态上相似但不密切相关的：长孢子囊藻的种类（Trechisporales，Basidiomycota）

皮质类真菌（重生的担子菌）的物种边界和地理分布通常鲜为人知。我们最近对子囊藻的研究表明，该属的物种多样性至少是以前公认的两倍。对物种多样性的重新估计是基于仅对属的一部分进行的研究。本研究揭示了另外三个物种的分子和形态多样性。我们从49个标本分别被称为鞘膜下囊虫，长链孢菌和长链孢菌的标本中产生了27个ITS和24个28S核糖体DNA序列。并收集在遥远的地理位置。我们用贝叶斯方法和最大似然方法评估了成对的相似性和DNA序列的系统发育关系。我们将系统发育信息与孢子和孢子虫的形态学数据相关联。我们发现这三个物种尽管在孢子形状和大小上相似，但并不密切相关。在其中一个物种S. perlongisporum中，我们检测到两个同胞谱系的存在。这些谱系在形态学上没有区别，除了在半胱氨酸平均长度上的微小差异。我们的研究提供了跨海洋物种分布在姬松茸中的另一个例子。