中国新记录巴克斯霉属Backusella的两个分类单元

摘要

Two taxa of the genus Backusella,B.circina var.circina and B.circina var.lamprospora stat.nov.(≡ B.lamprospora),were newly recorded from ten different provinces of China.Descriptions and line drawings are provided for both of them.A tentative key to all recognizable taxa of the genus is also provided.Reasons for reducing the two taxa from species to varieties are also discussed.Analyses based on ITS rDNA sequences revealed B.circina strains polyphyletic with Actinomucor,Mucor and Rhizomucor,suggesting a broad sense of this species,i.e.B.circina s.l.as well as a probable misidentification given molecular data only.%最近在中国十个省市发现了一个新记录属——巴克斯霉属Backusella,包括一个种的两个变种,即卷曲巴克斯霉原变种B.circina var.circina和卷曲巴克斯霉改级光孢变种B.circina var.lamprospora stat.nov.≡B.lamprospora.文章对这两个变种提供了形态描述和线条图,还提供了属内区分所有可以承认的分类群的检索表.把这两个分类群从种级降为变种级的理由亦有所讨论.ITS rDNA序列分析表明,卷曲巴克斯霉是一个多系类群,与放射毛霉属Actinomucor、毛霉属Mucor和根毛霉属Rhizomucor有着密切的谱系关系.这一结果暗示目前的卷曲巴克斯霉种的概念较大,可称为广义卷曲巴克斯霉B.circinas.l.；如果仅仅依靠分子数据,很有可能给出错误的分类学鉴定结果.