Abstract
Seven new azaphilone pigments named lenormandins A–G were isolated from stromata (fruiting bodies) of the xylariaceous fungus, Hypoxylon lenormandii using preparative High Performance Liquid Chromatography (HPLC) and their structures were elucidated by NMR spectroscopy, high resolution mass spectrometry and other spectral methods. Their occurrence in herbarium specimens (including various type materials collected in the 19th and early 20th century) and several fresh collections was studied by analytical HPLC with diode array and mass spectrometric detection (HPLC-DAD/MS), revealing that this group of pigments is specific for Hypoxylon lenormandii from various geographic regions and otherwise only occurs in closely related taxa, i.e. H. sublenormandii and an undescribed fungus from Sri Lanka, for which we propose the name H. jaklitschii. The status of the new species was established by using molecular phylogenetic data based on ITS and partial beta-tubulin sequences, and by detailed morphological studies.
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Acknowledgments
We gratefully acknowledge support from the curators of various international culture collections and herbaria, above all BCC, CBS, K, MFLUCC, MUCL and S, who provided important specimens for the present study. We also thank Markus Scholler (KR) for mediating international loan transactions. Prasert Srikitikulchai and J. Jennifer Luangsa-ard are thanked for their continuous work in finding important specimens during his field trips in Thailand and Jacques Fournier for his invaluable work on the taxonomy of Hypoxylon. The field sampling in Thailand benefited from a joint TRF-DAAD PPP academic exchange grant by the German Academic Exchange Service (DAAD) and the Thai Royal Golden Ph.D. Jubilee-Industry program (RGJ) to Kevin D. Hyde, Eric Kuhnert and Marc Stadler. The DAAD and the Argentina Ministerio de Ciencia, Tecnología e Innovación Productiva are also gratefully acknowledged for an academic exchange program involving Adriana Hladki, Eric Kuhnert, Esteban Benjamin Sir and Marc Stadler. Furthermore, we are grateful to various colleagues at the HZI: Kathrin I. Mohr and Wera Collisi for conducting the bioassays and Christel Kakoschke for recording NMR spectra. Manfred Rohde is thanked for SEM recordings. For measurements of the HPLC–HRMS data we are grateful to Aileen Teichmann. We also thank Philine Wotsch for technical assistance in culture maintenance and Rolf Jansen for proofreading the chemical part.
The authors would also like to express their gratitude to Administration of National Parks of Argentina, Ministry of environment of Salta province and Provincial Direction of Biodiversity of Jujuy province for authorization of collection.
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Hypoxylon jaklitschii Sir & Kuhnert, sp. nov.
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Kuhnert, E., Surup, F., Sir, E.B. et al. Lenormandins A—G, new azaphilones from Hypoxylon lenormandii and Hypoxylon jaklitschii sp. nov., recognised by chemotaxonomic data. Fungal Diversity 71, 165–184 (2015). https://doi.org/10.1007/s13225-014-0318-1
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DOI: https://doi.org/10.1007/s13225-014-0318-1