The genus Quambalaria consists of plant-pathogenic fungi causing disease on leaves and shoots of species of Eucalyptus and its close relative, Corymbia. The phylogenetic relationship of Quambalaria spp., previously classified in genera such as Sporothrix and Ramularia, has never been addressed. It has, however, been suggested that they belong to the basidiomycete orders Exobasidiales or Ustilaginales. The aim of this study was thus to consider the ordinal relationships of Q. eucalypti and Q. pitereka using ribosomal LSU sequences. Sequence data from the ITS nrDNA were used to determine the phylogenetic relationship of the two Quambalaria species together with Fugomyces (= Cerinosterus) cyanescens. In addition to sequence data, the ultrastructure of the septal pores of the species in question was compared. From the LSU sequence data it was concluded that Quambalaria spp. and F. cyanescens form a monophyletic clade in the Microstromatales, an order of the Ustilaginomycetes. Sequences from the ITS region confirmed that Q. pitereka and Q. eucalypti are distinct species. The ex-type isolate of F. cyanescens, together with another isolate from Eucalyptus in Australia, constitute a third species of Quambalaria, Q. cyanescens (de Hoog & G.A. de Vries) Z.W. de Beer, Begerow & R. Bauer comb. nov. Transmission electron-microscopic studies of the septal pores confirm that all three Quambalaria spp. have dolipores with swollen lips, which differ from other members of the Microstromatales (i.e. the Microstromataceae and Volvocisporiaceae) that have simple pores with more or less rounded pore lips. Based on their unique ultrastructural features and the monophyly of the three Quambalaria spp. in the Microstromatales, a new family, Quambalariaceae Z.W. de Beer, Begerow & R. Bauer fam. nov., is described.

中文翻译：

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Quambalariaceae fam 的系统发育。11 月，包括南非和澳大利亚的重要桉树病原体。

Quambalaria 属由植物病原真菌组成，可引起桉树及其近亲 Corymbia 物种的叶子和枝条疾病。Quambalaria spp. 的系统发育关系，以前被归类为 Sporothrix 和 Ramularia 等属，从未得到解决。然而，有人认为它们属于担子菌目 Exobasidiales 或 Ustilaginales。因此，本研究的目的是使用核糖体 LSU 序列考虑 Q. eucalypti 和 Q. pitereka 的序数关系。来自 ITS nrDNA 的序列数据用于确定两种 Quambalaria 物种与 Fugomyces (= Cerinosterus) cyanescens 的系统发育关系。除了序列数据外，还比较了所讨论物种的隔膜孔的超微结构。从 LSU 序列数据可以得出结论，Quambalaria spp。和 F. cyanescens 在 Microstromatales 中形成一个单系进化枝，这是 Ustilaginomycetes 的一个目。来自 ITS 区域的序列证实 Q. pitereka 和 Q. eucalypti 是不同的物种。F. cyanescens 的 ex-type 分离物与澳大利亚桉树的另一种分离物一起构成了 Quambalaria 的第三种物种，Q. cyanescens (de Hoog & GA de Vries) ZW de Beer, Begerow & R. Bauer comb。十一月 隔膜孔的透射电子显微镜研究证实，所有三种 Quambalaria spp。具有唇部肿胀的 dolipores，这不同于 Microstromatales 的其他成员（即 Microstromataceae 和 Volvocisporiaceae），后者具有简单的毛孔，或多或少圆形的毛孔唇部。基于它们独特的超微结构特征和三种 Quambalaria spp 的单一性。在Microstromatales，一个新科，Quambalariaceae ZW de Beer, Begerow & R. Bauer fam。11 月，描述。