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Taxonomy of the Sphaerostilbella broomeana-group (Hypocreales, Ascomycota).
Mycological Progress ( IF 2.4 ) Pub Date : 2019-01-23 , DOI: 10.1007/s11557-018-01468-w
Kadri Põldmaa 1 , Gerald Bills 2 , David P Lewis 3 , Heidi Tamm 1
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Three new species, closely related to Sphaerostilbella broomeana, are described from the USA and India. These species form septate conidia from simple conidiophores with individual branches terminating in a single phialide and chlamydospores. Teleomorphs, known for S. broomeana and S. appalachiensis, are characterised by hairy perithecia and fusiform, apiculate, and conspicuously warted ascospores. This combination of characters distinguishes the S. broomeana-group from other members of Sphaerostilbella that all form gliocladium-type anamorphs and mostly grow on basidiomata of Stereum spp. Like in other species of the genus, the majority of hosts of the species described in this paper belong to wood-inhabiting taxa of Russulales. Sphaerostilbella broomeana had been recorded from a few regions in Europe and exclusively on Heterobasidion annosum. Herein, it is reported also from H. parviporum in many other localities and on H. insulare s.l. at the foothills of the Himalayas. Its sister species, found in the same region in northern India on another member of Russulales (Dichostereum effuscatum), is described as S. himalayensis. The two species described from North America colonize polypores from various taxa. Whereas S. appalachiensis occurs in eastern USA, with H. irregulare among its hosts, S. toxica is so far known only from two locations in eastern Texas, growing on Gloeophyllum striatum (Polyporales). Despite their great similarity in morphology and ITS rDNA, TEF1 sequences clearly distinguish these two North-American species. Moreover, the two strains of S. toxica appeared metabolically distinct as their organic extracts strongly inhibited the growth of human pathogenic microbes grown in vitro. Phylogenetic analysis of rDNA sequences supports monophyly of the genus Sphaerostilbella and the included S. broomeana-group, established here.

中文翻译:

球形小球菌群(Hypocreales,Ascomycota)的分类学。

美国和印度描述了三个与布鲁氏球菌密切相关的新物种。这些物种由简单的分生孢子形成分离的分生孢子,分生孢子的单个分支终止于单个phialide和衣原体孢子。Teleomorphs(以S. broomeanaS. appalachiensis闻名)的特征是毛状的皮膜和梭形,细小和明显扭曲的子囊孢子。字符的组合区分S. broomeana从其他成员-基Sphaerostilbella所有形式粘帚式无性型和主要生长在的basidiomataspp。像该属的其他物种一样,本文所述物种的大多数寄主属于Russulales的木材居住类群。Sphaerostilbella broomeana已经从欧洲和专门在少数地区记录Heterobasidion annosum。在此,在许多其他地方的小孢子虫也有报道,在喜马拉雅山山麓的insulare sl也有报道。它的姊妹物种在印度北部的同一地区的RussulalesDichestereum effuscatum)的另一个成员上发现,被称为喜马拉雅沙门氏菌。北美描述的两个物种在各种分类单元中定居了多孔菌。而沙门氏菌毒链霉菌S. toxica)发生在美国东部,其寄主中有不规则嗜血杆菌,迄今为止仅在得克萨斯州东部的两个地方生长,生长在纹状体(Polyporales)上。尽管它们在形态和ITS rDNA方面非常相似,但TEF1序列却清楚地区分了这两个北美物种。此外,由于它们的有机提取物强烈抑制了体外培养的人类致病微生物的生长,因此这两种毒链霉菌菌株在代谢上显得截然不同。rDNA序列的载体的系统发育分析单系属的Sphaerostilbella和所包括的S. broomeana -基,这里建立的。
更新日期:2019-01-23
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