Abstract
The genus Entonaema comprises Xylariaceae with hollow, gelatinous stromata that accumulate liquid. Some of its species, including the type species, appear related to Daldinia from a polyphasic approach, comprising morphological studies, comparisons of ribosomal DNA sequences, and high performance liquid chromatography (HPLC) profiles with diode array and mass spectrometric detection (HPLC-DAD-MS). This methodology was used to study Entonaema pallidum. Its major stromatal constituent was identified as xylaral, a secondary metabolite known from Xylaria polymorpha. This compound was detected in several Xylaria spp., including the tropical X. telfairii and morphologically similar taxa, whose stromata may also become hollow and filled with liquid. Cultures of E. pallidum resembled those of Xylaria, substantially differing from other Entonaema spp., in their morphology, 5.8S/ITS nrDNA sequences, and HPLC profiles. The type specimen of E. mesentericum was located in the spirit collection of the herbarium B and found to agree morphologically with the nomenclatorily younger E. pallidum. Traces of xylaral were even detected by HPLC-DAD-MS in the spirit in which the fungus had been preserved. Entonaema pallidum is thus regarded as a later synonym of E. mesentericum. Therefore, the latter name is transferred to Xylaria. A key to entonaemoid Xylariaceae is provided. Colour reactions (NH3, KOH) of the ectostroma were applied to a limited number of Xylaria spp., but metabolite profiles of cultures appear more promising as chemotaxonomic traits to segregate this genus. As xylaral was also found in Nemania and Stilbohypoxylon spp., while being apparently absent in Hypoxylon and allied genera, it may be a chemotaxonomic marker for Xylariaceae with Geniculosporium-like anamorphs.
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Notes
These terms correspond to “subfamilies”, Hypoxyloideae and Xylarioideae, which were used in previous publications but are not valid taxa; see Bitzer et al. (2008).
A luxurious collection (TL-8380, unfortunately lost in a fire) can be viewed on http://www.mycokey.com/Ecuador.htmls.
(for specimens with larger ascospores cf. E. moluccanum ss. Sánchez-Jacomé & Guzmán-Davalos 2005).
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Acknowledgements
Our warmest thanks go to Burghard Hein and Harrie Sipman (B), Genevieve Lewis-Gentry (FH), Anna-Lena Anderberg (S), Begoña Aguirre-Hudson (K), Ellen Bloch (NY), Erin McCray (BPI), Laura Guzmán-Dávalos (GUAD) and all other curators of public herbaria, for kindly sending us specimens, and to Dagmar Triebel (M), also for help with international loan transactions. We acknowledge the input by Régis Courtecuisse, Lille, for facilitating collection work in the French West Indies. Furthermore, we thank Jack D. Rogers, Francoise Candoussau, Jean Louis Cheype and Ralph Mangelsdorff, for providing us with specimens, and Wolfgang Steglich (Munich, Germany) and Norbert Arnold (Leibniz Institute for Plant Biochemistry, Halle/Saale, Germany) for providing us with a standard of xylaral. Expert technical assistance by Dirk Müller (InterMed) for recording HPLC-MS spectra, and by Beata Schmieschek and Michael Benfer (dto.) for assistance in handling the cultures and performing HPLC-DAD analyses, is also gratefully acknowledged. Finally, we thank two anonymous referees for their valuable comments, which substantially improved our manuscript.
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Xylaria mesenterica (Möller) M. Stadler, Læssøe & J. Fournier.
This paper is dedicated to the memory of our colleague Jean-F. Magni.
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Stadler, M., Fournier, J., Læssøe, T. et al. Recognition of hypoxyloid and xylarioid Entonaema species and allied Xylaria species from a comparison of holomorphic morphology, HPLC profiles, and ribosomal DNA sequences. Mycol Progress 7, 53–73 (2008). https://doi.org/10.1007/s11557-008-0553-5
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DOI: https://doi.org/10.1007/s11557-008-0553-5