The Gnomoniaceae are characterised by ascomata that are generally immersed, solitary, without a stroma, or aggregated with a rudimentary stroma, in herbaceous plant material especially in leaves, twigs or stems, but also in bark or wood. The ascomata are black, soft-textured, thin-walled, and pseudoparenchymatous with one or more central or eccentric necks. The asci usually have a distinct apical ring. The Gnomoniaceae includes species having ascospores that are small, mostly less than 25 mum long, although some are longer, and range in septation from non-septate to one-septate, rarely multi-septate. Molecular studies of the Gnomoniaceae suggest that the traditional classification of genera based on characteristics of the ascomata such as position of the neck and ascospores such as septation have resulted in genera that are not monophyletic. In this paper the concepts of the leaf-inhabiting genera in the Gnomoniaceae are reevaluated using multiple genes, specifically nrLSU, translation elongation factor 1-alpha (tef1-alpha), and RNA polymerase II second largest subunit (rpb2) for 64 isolates. ITS sequences were generated for 322 isolates. Six genera of leaf-inhabiting Gnomoniaceae are defined based on placement of their type species within the multigene phylogeny. The new monotypic genus Ambarignomonia is established for an unusual species, A. petiolorum. A key to 59 species of leaf-inhabiting Gnomoniaceae is presented and 22 species of Gnomoniaceae are described and illustrated.

中文翻译：

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蓼科、Diaporthales 的叶栖属。


蓼科的特征是子囊通常浸没在草本植物材料中，单独，没有子座，或与初级子座聚集，特别是在叶、小枝或茎中，但也在树皮或木材中。子囊呈黑色，质地柔软，壁薄，呈假薄壁组织，有一个或多个中央或偏心颈。子囊通常具有明显的顶环。蓼科包括具有较小子囊孢子的物种，大多数子囊孢子长度小于25微米，尽管有些更长，并且间隔范围从无隔膜到单隔膜，很少有多个隔膜。对蓼科的分子研究表明，基于子囊特征（例如颈部位置）和子囊孢子（例如间隔）的传统分类导致了非单系的属。在本文中，使用多个基因，特别是 64 个分离株的 nrLSU、翻译延伸因子 1-α (tef1-alpha) 和 RNA 聚合酶 II 第二大亚基 (rpb2) 重新评估了蓼科叶栖属的概念。生成了 322 个分离株的 ITS 序列。叶栖蓼科的六个属是根据其模式种在多基因系统发育中的位置来定义的。新的单型 Ambarignomonia 属是为一种不寻常的物种 A. petiolorum 建立的。介绍了 59 种叶生蓼科植物的索引，并对 22 种蓼科植物进行了描述和说明。