Instituto de Ecología, A.C., Apdo. Postal 63, Xalapa, Veracruz, 91000 México.
Mycologia. 2011 May-Jun;103(3):631-40. doi: 10.3852/10-230. Epub 2010 Dec 21.
During a study of the microfungi on decaying leaves collected in México we encountered a fungus sharing features of the anamorph genera Heliocephala and Holubovaniella. This hyphomycete resembled Hol. elegans in possessing obclavate to fusiform, three-septate, rostrate phragmoconidia, but it can be distinguished by its much shorter, branched, determinate conidiophores. Unlike members of genus Heliocephala, which also possess determinant conidiophores, the phragmoconidia of this taxon are short-rostrate and have not been observed to germinate iteratively. Prompted by the discovery of this hyphomycete, we investigated the phylogenetic relationships among species of Heliocephala and Holubovaniella. Analysis of large subunit rDNA gene sequences positioned species of Heliocephala and Holubovaniella in the Dothideomycetes and identified Stomiopeltis betulae (Micropeltididaceae) as their closest relative. These results also indicated that Heliocephala and Holubovaniella are closely related taxa. Based on these findings and the similarity of the developmental and morphological characters of species of Heliocephala and Holubovaniella, we recognize these genera as synonymous and describe a new species, Heliocephala triseptata. A dichotomous key to the species of Heliocephala is provided.
在对墨西哥采集的腐烂叶片上的小型真菌进行研究时，我们遇到了一种真菌，它具有拟青霉属和 Holubovaniella 属的特征。这种丝孢菌在具有棍棒形到梭形、三分隔、喙状孢梗的分生孢子方面与 Hol. elegans 相似，但可以通过其更短、分枝、确定的分生孢子梗来区分。与也具有定殖分生孢子梗的 Heliocephala 属成员不同，该分类群的分生孢子是短喙状的，并且尚未观察到它们的反复萌发。由于发现了这种丝孢菌，我们研究了 Heliocephala 和 Holubovaniella 属种之间的系统发育关系。大亚基 rDNA 基因序列分析将 Heliocephala 和 Holubovaniella 属种定位在散囊菌目中，并确定了桦木 Stomiopeltis betulae（Micropeltididaceae）是它们最接近的亲缘关系。这些结果还表明 Heliocephala 和 Holubovaniella 是密切相关的分类群。基于这些发现以及 Heliocephala 和 Holubovaniella 属种发育和形态特征的相似性，我们将这些属视为同义词，并描述了一个新种，即 Heliocephala triseptata。提供了 Heliocephala 属种的二叉分类关键。
