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引用次数: 0
摘要
在美国和捷克共和国对与松属相关的微真菌进行的独立调查中,收集到一种与Septonema Corda的通用概念相匹配的独特真菌。其特点是分生孢子、分枝、分生孢子和菌丝有明显的纹饰,从疣状到强烈疣状,疣状突出圆形,颜色为黄褐色到棕色或红棕色,在松木和树皮上形成密集的絮状、深棕色或深红褐色菌落。分生孢子为圆柱形或近圆柱形,产生于短的、简单的或分枝的顶尖链。包括核糖体(LSU)和蛋白质编码基因(EF1-α)序列数据在内的多基因系统发育分析表明,这两个集合是同源的,属于Mytilinidiales (Dothideomycetes, Ascomycota),在那里它们与其他已知具有中隔膜样变形的mytilinidiaceae真菌类群很远。为了在系统发育定位的基础上提供一个合适的名称,并可能限制严格感Septonema,我们在分析中包括了一个非孢子的,假定属于S. secedens Corda的属型菌株。DNA序列数据显示该菌株属于Venturiaceae (Venturiales, Dothideomycetes),但相应的植物标本馆标本的形态学检查显示它属于S. fasciculare (Corda) S. Hughes。由于该属的多系性和其模式种的未知系统发育位置,我们的真菌作为一个新种被容纳在Septonema中,命名为s.l ohmanii G. Delgado & Koukol, sp. nov。
Septonema lohmanii G. Delgado & O. Koukol, sp. nov., a New Species in Mytilinidiales (Dothideomycetes) and the Phylogenetic Position of S. fasciculare (Corda) S. Hughes
ABSTRACT During independent surveys of microfungi associated with Pinus spp. in the United States and the Czech Republic, a distinct fungus matching the generic concept of Septonema Corda was collected. It is characterized by distinctly ornamented conidiophores, branches, conidia and hyphae, ranging from verruculose to strongly verrucose with prominent rounded warts, yellowish brown to brown or reddish brown in color and forming densely floccose, dark brown or dark reddish brown colonies on pine wood and bark. Conidia are cylindrical or subcylindrical and produced in short, simple or branched acropetal chains. Multigene phylogenetic analyses including nuclear ribosomal (LSU) and protein coding gene (EF1-α) sequence data suggest that both collections are conspecific and belong to the order Mytilinidiales (Dothideomycetes, Ascomycota) where they group distant from other mytilinidiaceous fungi with known septonema-like anamorphs. To provide a proper name based on phylogenetic placement and to possibly circumscribe Septonema sensu stricto, a non-sporulating, putative strain belonging to S. secedens Corda, the generic type, was included in the analyses. DNA sequence data placed this strain within the family Venturiaceae (Venturiales, Dothideomycetes) but morphological examination of the corresponding herbarium specimen revealed that it belongs instead to S. fasciculare (Corda) S. Hughes. Because of the polyphyletic nature of the genus and the unknown phylogenetic position of its type species, our fungus is accommodated in Septonema as a new species named S. lohmanii G. Delgado & Koukol, sp. nov.
期刊介绍:
Cryptogamie is divided into three sections, each published as an individual publication: Cryptogamie, Bryologie, Cryptogamie, Algologie and Cryptogamie, Mycologie. Cryptogamie is a French journal of international scope publishing in several European languages. It accepts original papers and review articles on the systematics, biology and ecology of all cryptogams (algae; bryophytes; fungi and lichens, respectively).