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Evidence for the polyphyly of Encoelia and Encoelioideae with reconsideration of respective families in Leotiomycetes

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Abstract

This study focuses on the genus Encoelia and the subfamily Encoelioideae in the morphologically and ecologically diverse Helotiales. The 28S and 18S rDNA as well as tef1, rpb1 and rpb2 were sequenced for 70 species. Phylogenetic analyses revealed Encoelia and Encoelioideae to be highly polyphyletic, with species distributed among eight major lineages. Encoelia fascicularis and E. pruinosa belonged to Sclerotiniaceae and were combined in a new genus, Sclerencoelia. Rutstroemiaceae comprised E. tiliacea and Dencoeliopsis johnstonii, both accepted in Rutstroemia. The type of Encoelia, E. furfuracea, was closely related to species of Velutarina, Cenangiopsis and Crumenulopsis. These species together with members of Hemiphacidiaceae formed a clade conforming to the emended concept of Cenangiaceae, introduced here. Another resurrected family, Cordieritidaceae, comprised E. fimbriata, E. heteromera and species of Ameghiniella, Cordierites, Diplocarpa and Ionomidotis, characterised by inamyloid asci and a positive ionomidotic reaction. Encoelia glauca showed closest affinities with Chlorociboria species in Chlorociboriaceae. A new genus, Xeropilidium, with sporodochial and pycnidial synanamorphs, was described for the distinct encoelioid member of the Chaetomellaceae, previously known as E. fuckelii. Morphological and ecological synapomorphies were distinguished from convergent characters to delimit monophyletic taxa including encoelioid fungi. Incorporation of public sequences from various biological samples in ITS rDNA analyses allowed identification of sequenced organisms at species, genus, or family level and added information on the ecology of seversal taxa. Members of Cenangiaceae appeared to be widespread as endophytes. Inclusion of encoelioid genera in Chaetomellaceae and Sclerotiniaceae added xylicolous saprotrophs to these families.

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Acknowledgments

We are grateful to the late Ain Raitviir, under whose supervision this study was initiated. D. Pfister is acknowledged for valuable comments and for providing a recent Ameghiniella specimen, and G. Marson for sending an isolate of Xeropilidium and DNA sequences of some taxa. R. Galán, P. Johnston and A. Suija shared unpublished molecular results, and A. Suija added her ideas concerning lichenicolous fungi. J. Tanney is acknowledged for forwarding images and the description of a recent Sclerencoelia specimen. B. Perić, T. Læssøe, G. Marson, N. Aplin, A. Bogacheva, U. Graf, J. Karakehian, O. Koukol, A. Ordynets, B. Senn-Irlet, A. Voitk and curators of BPI, C, CUP, GB, FH, K, M, NY, O, OULU, S and TNS fungal collections are thanked for sending specimens, and Rasmus Puusepp for conducting the PCR. A. Bollmann, J.P. Dechaume, M. Hairaud, V. Liiv, B. Perić, J.H. Petersen, E. Rubio and I. Wagner provided images of encoelioid fungi. R. Szava-Kovats is thanked for linquistic proofreading. The study was supported by the Estonian Science Agency (project IUT20-30), the European Regional Development Fund (Centre of Excellence EcolChange).

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  1. Institute of Ecology and Earth Sciences, University of Tartu, Lai 40, EE-51005, Tartu, Estonia

    Kadri Pärtel, Heidi Tamm & Kadri Põldmaa

  2. Mycological Collections, Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences, Tartu, Estonia

    Kadri Pärtel

  3. Blaihofstraße 42, 72074, Tübingen, Germany

    Hans-Otto Baral

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  1. Kadri Pärtel
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Pärtel, K., Baral, HO., Tamm, H. et al. Evidence for the polyphyly of Encoelia and Encoelioideae with reconsideration of respective families in Leotiomycetes. Fungal Diversity 82, 183–219 (2017). https://doi.org/10.1007/s13225-016-0370-0

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