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首页> 外文期刊>Mycologia >Two new species of Pseudogymnoascus with Geomyces anamorphs and their phylogenetic relationship with Gymnostellatospora
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Two new species of Pseudogymnoascus with Geomyces anamorphs and their phylogenetic relationship with Gymnostellatospora

机译：带有假单胞菌的假单胞菌的两个新种及其与裸子藻的系统发育关系

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摘要

Two new psychrophilic Pseudogymnoascus species with Geomyces anamorphs are described from a Sphagnum bog in Alberta, Canada. Pseudogymnoascus appendiculatus has long, branched, orange appendages and smooth, fusoid to ellipsoidal ascospores with a faint longitudinal rim. Pseudogymnoascus verrucosus has short, subhyaline appendages and warty peridial hyphae and ascospores, and both smooth to asperulate and irregularly warty conidia. Both species produce asci in chains, a feature that supports the distinction between this group and Myxotrichum, which produces asci singly. The discovery of species intermediate between Pseudogymnoascus and Gymnostellatospora, in having both ornamented ascospores and Geomyces anamorphs, prompted a re-evaluation of the genera. Sequence analysis of the internal transcribed spacer regions (ITS) of the nuclear ribosomal DNA indicates that the two genera remain distinct and comprise a monophyletic group. Pseudogymnoascus species have smooth to warty or lobate-reticulate ascospores while species of Gemnostellatospora have walnut-shaped spores with distinct longitudinal crests and striations. Anamorphs assignable to the form genus Geomyces are allied with both genera. A key is provided to the four species and varieties of Pseudogymnoascus.
机译：从加拿大艾伯塔省的一个泥炭藓沼泽中描述了两个新的嗜水假单胞菌属物种，具有变形真菌。 Pseudogymnoascus appendiculatus具长的，分支的，橙色的附属物，以及平滑的，融合到椭圆形的子囊状孢子，纵向边缘微弱。疣状假单胞菌具有短的，亚透明膜下的附件和疣状的周生菌丝和子囊孢子，并且平滑地散布和不规则的疣状分生孢子。两种物种都产生链上的asci，这一特征支持了该群体与单独产生asx的Myxotrichum之间的区别。发现假单胞菌属和裸子藻属之间的中间物种，同时具有装饰性的子囊孢子和无水Geomyces变形体，促使对该属进行重新评估。核糖体DNA的内部转录间隔区（ITS）的序列分析表明，这两个属保持不同，并包含一个单基因组。假单胞菌属的种具有光滑至结节状或叶状网状的子囊孢子，而Gemnostellatospora的种属具有核桃形的孢子，具有明显的纵向波峰和条纹。可分配给Geomyces属的无性型与这两个属相关。提供了对假单胞菌的四个种类和变种的钥匙。

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