Hypomontagnella (Hypoxylaceae): a new genus segregated from Hypoxylon by a polyphasic taxonomic approach
During a survey of xylarialean Sordariomycetes in North-western Argentina, several collections representing a new species morphologically resembling the pantropical Hypoxylon monticulosum was encountered. They were studied by a combination of morphological and chemotaxonomic studies along with a multi-locus phylogeny of Hypoxylon and related genera of the Hypoxylaceae based on a combined ITS, LSU, TUB2, and RBP2 dataset. The phylogenetic tree revealed that DNA sequences of the new fungus clustered together with Hypoxylon monticulosum and Hypoxylon submonticulosum in a separate clade. In addition, all representatives of this clade produced the antifungal polyketides of the sporothriolide type in standardized submerged cultures. Furthermore, a comparison of the morphology of this group of species formerly placed in Hypoxylon, including H. austrobahiense and H. rubigineoareolatum, also revealed certain morphological similarities. They are therefore accommodated in the new genus Hypomontagnella, with Hypomontagnella monticulosa as type species, and the new Argentine fungus is described as Hypomontagnella barbarensis.
KeywordsAscomycota Chemotaxonomy New genus New species Systematics
The authors express their appreciation to the Administración de Parques Nacionales of Argentina, Ministerio de Medio Ambiente of Salta Province and Dirección Provincial de Biodiversidad of Jujuy Province for authorization of collection.
LW gratefully acknowledges a PhD stipend from the Hannover School for Biomolecular Drug Research (HSBDR). The German Academic Exchange Service (DAAD) and the Argentina Ministerio de Ciencia, Tecnología e Innovación Productiva are gratefully acknowledged for an academic exchange grant to AIH and EBS. We gratefully acknowledge support from the curators of various international herbaria, and to all our co-authors of previous papers on the Xylariales. In particular, we thank Andrea I. Romero (UBA-CONICET) for her invaluable work on the taxonomy of xylarialean fungi from Northwestern Argentina. Manfred Rohde is thanked for SEM recordings. Vanessa Stiller and Anke Skiba are thanked for expert technical assistance and Nadine Wurzler is thanked for sequencing work.
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