ABSTRACT Cortinarius is a species-rich ectomycorrhizal genus containing taxa that exhibit agaricoid or sequestrate basidiome morphologies. In New Zealand, one of the most recognizable and common Cortinarius species is the purple sequestrate fungus, C. porphyroideus. We used genome skimming of the almost 100-y-old type specimen from C. porphyroideus to obtain the nuc rDNA internal transcribed spacer region ITS1-5.8S-ITS2 (ITS barcode) and partial nuc rDNA 28S (28S) sequences. The phylogenetic position of C. porphyroideus was established, and we found that it represents a rarely collected species. Purple sequestrate Cortinarius comprise multiple cryptic species in several lineages. We describe four new species of Cortinarius with strong morphological similarity to C. porphyroideus: Cortinarius diaphorus, C. minorisporus, C. purpureocapitatus, and C. violaceocystidiatus. Based on molecular evidence, Thaxterogaster viola is recognized as Cortinarius violaceovolvatus var. viola. These species are associated with Nothofagus (southern beech) and have very similar morphology to C. porphyroideus but are all phylogenetically distinct based on molecular data.

中文翻译：

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紫色阴霾：新西兰神秘的紫色隔离 Cortinarius

摘要 Cortinarius 是一个物种丰富的外生菌根属，含有类群，表现出类蘑菇或隔离担子组形态。在新西兰，最知名和最常见的 Cortinarius 物种之一是紫色隔离真菌 C. porphyroideus。我们使用来自 C. porphyroideus 的几乎 100 岁的类型标本的基因组略读来获得 nuc rDNA 内部转录间隔区 ITS1-5.8S-ITS2（ITS 条码）和部分 nuc rDNA 28S (28S) 序列。确定了 C. porphyroideus 的系统发育位置，我们发现它代表了一个很少收集的物种。紫色螯合 Cortinarius 包含多个谱系中的多个神秘物种。我们描述了四种与 C. porphyroideus 具有很强形态相似性的 Cortinarius 新物种：Cortinarius diaphorus、C. minorisporus、C. purpureocapitatus 和 C. violaceocystidiatus。根据分子证据，Thaxterogaster viola 被认为是 Cortinarius violaceovolvatus var。中提琴。这些物种与 Nothofagus（南山毛榉）相关并且具有与 C. porphyroideus 非常相似的形态，但基于分子数据在系统发育上都是不同的。