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Taxonomy and species delimitation in Sporodictyon (Verrucariaceae) in Northern Europe and the adjacent Arctic – reconciling molecular and morphological data
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Evolution, Genomics and Systematics, Systematic Biology.
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Evolution, Genomics and Systematics, Systematic Biology.
2009 (English)In: Taxon, ISSN 0040-0262, Vol. 58, no 2, 585-605 p.Article in journal (Refereed) Published
Abstract [en]

Morphological variation in Sporodictyon is scrutinized in an effort to   reconcile it with monophyletic groups based oil molecular evidence.   Molecular data (nucITS, nucLSU, RPBI) are investigated by Bayesian and parsimony phylogenetic analyses, statistical parsiniony, and split   decomposition. Morphological variation within and between the   monophyletic groups is evaluated. Four monophyletic groups strongly  Supported by Molecular data correspond to morphologically well-characterized species. Sporodictyon schaererianum and S. terrestre   are morphologically variable, especially with respect to thallus   structure. Two distinct subclades are found in both species, but they   could, however, not be distinguished morphologically and may be   regarded as cryptic species. A combination of ascoma size, spore   pigmentation, spore size and thallus structure characterizes the   species recognized, whereas thallus thickness, involucrellum thickness   and excipulum pigmentation are found to be quite plastic. A taxonomic revision of Sporodictyon Northern Europe and the adjacent Arctic is   provided, recognizing five species. Two new species, S. arcticum and S.   minutum, are described. The name Polyblastia theleodes has been  misapplied for S. schaereriamum. Several taxonomic synonyms are   proposed, particularly for S. terrestre, and lectotypes for several species names are designated.

Place, publisher, year, edition, pages
2009. Vol. 58, no 2, 585-605 p.
Keyword [en]
haplotype networks, MCMC, phylogeny, species recognition, split decomposition analysis, revision
National Category
Biological Sciences
URN: urn:nbn:se:uu:diva-96491ISI: 000266525800022OAI: oai:DiVA.org:uu-96491DiVA: diva2:171080
Available from: 2007-11-22 Created: 2007-11-22 Last updated: 2014-09-03
In thesis
1. Phylogeny and Taxonomy of Polyblastia and allied taxa (Verrucariaceae)
Open this publication in new window or tab >>Phylogeny and Taxonomy of Polyblastia and allied taxa (Verrucariaceae)
2007 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Polyblastia A. Massal. is a genus of lichenized fungi belonging to Verrucariaceae (Ascomycota). Traditional classification heavily rested on a few cardinal characters, primarily ascoma structure and spore morphology, but the delimitation of Polyblastia was problematic. Using DNA sequences from nucLSU, and RPB1 the position of the ‘Polyblastia group’, as a strongly supported clade within Verrucariaceae, was confirmed. A three marker phylogeny (including nucITS) based on a wide taxon sampling reveals strongly supported clades within the ‘Polyblastia group’. Thus Polyblastia s.str. is recognized. The phylogeny of the strongly supported Thelidium clade is not completely resolved. In a different clade, Verrucaria rupestris, the type of Verrucaria, is a sister to the Henrica melaspora/H. theleodes clade. Trimmatothele perquisita, the type of Trimmatothele, forms a strongly supported group with a Verrucaria species. The genus Sporodictyon, until recently included in Polyblastia, is resurrected.

Species delimitation in Sporodictyon is investigated, and the morphological variation within and between the monophyletic groups is evaluated in an effort to reconcile morphological and molecular data. A taxonomic revision of Sporodictyon, occurring in Northern Europe and the adjacent Arctic is provided, and two new species are described. A comprehensive material is investigated, a key to the species is provided.

A generic revision of the family Verrucariaceae, based on recent molecular phylogenetic analyses and previous morphological studies, is offered. Three new genera (Hydropunctaria, Parabagliettoa and Wahlenbergiella) are proposed. Several other monophyletic groups are identified for which the taxon sampling is insufficient for proposing taxonomic changes. The nomenclature of the genera in the family is revised, including the study of type materials and several lectotypifications are suggested.

The new genus Atla (Verrucariaceae) is described, and three new species to science, A. alpina, A. palicei and A. praetermissa, are included. An identification key to the species and a revision of the genus is supplied.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2007. 33 p.
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 370
Biology, Phylogeny, Taxonomy, ITS, LSU, RPB1, Nomenclature, Biologi, Polyblastia, Verrucariaceae, Sporodictyon, Atla, Thelidium, Verrucaria, Staurothele, Trimmatothele
urn:nbn:se:uu:diva-8326 (URN)978-91-554-7035-7 (ISBN)
Public defence
2007-12-14, Lindahlsalen, EBC, Norbyvägen 18A, Uppsala, 10:00 (English)
Available from: 2007-11-22 Created: 2007-11-22 Last updated: 2009-04-02Bibliographically approved

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