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Widhelm, T./ Egan, R.S./ Bertoletti, F.R./ Asztalos, M.J./ Leavitt, S.D./ Lumbsch, H.T. 2016: [Abstract:] Picking holes in traditional species delimitations: An integrative taxonomic reassessment of Parmotrema perforatum group (Parmeliaceae, Ascomycota). - In: : IAL8 Abstracts. . pp. 27. [RLL List # 249 / Rec.# 39269]
Abstract: Accurate species delimitation is important since species are a fundamental unit in biological research. In lichenized-fungi, species delimitation has been difficult due to a lack in taxonomically important characters and due to the limits of traditional, morphology-based species concepts. We apply an integrative approach to reassess the taxonomy of the Parmotrema perforatum group; six closely related species divided into three species pairs, each pair comprising one apotheciate (sexual) and one sorediate (asexual) species. Each pair is further characterized by a distinct combination of secondary metabolites. Species boundaries were reexamined using an integrative approach incorporating morphological, chemical, and molecular sequence data to delimit species boundaries. Phylogenies were inferred from a seven-locus DNA sequence dataset using both concatenated gene tree and coalescent-based species tree inference methods. We employed multispecies coalescent method implemented in the program BP&P to validate candidate species. Micromorphological measurements of conidia were found to be congruent with clusters found in the phylogenetic analyses, uncovering unknown evolutionary relationships. Each approach that we applied to the P. perforatum group consistently recovered four of the currently circumscribed species P. perforatum, P. hypotropum, P. subrigidum, and P. louisianae, while P. preperforatum and P. hypoleucinum were consistently interpreted as conspecific.
URL: http://ial8.luomus.fi/wp-content/uploads/2014/09/IAL8_abstracts3007.pdf
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