uu.seUppsala University Publications
Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Phylogeny and Taxonomy of Polyblastia and allied taxa (Verrucariaceae)
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Evolution, Genomics and Systematics, Systematic Botany.
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. , p. 33
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 370
Keywords [en]
Biology, Phylogeny, Taxonomy, ITS, LSU, RPB1, Nomenclature
Keywords [sv]
Biologi
Keywords [la]
Polyblastia, Verrucariaceae, Sporodictyon, Atla, Thelidium, Verrucaria, Staurothele, Trimmatothele
Identifiers
URN: urn:nbn:se:uu:diva-8326ISBN: 978-91-554-7035-7 (print)OAI: oai:DiVA.org:uu-8326DiVA, id: diva2:171083
Public defence
2007-12-14, Lindahlsalen, EBC, Norbyvägen 18A, Uppsala, 10:00 (English)
Opponent
Supervisors
Available from: 2007-11-22 Created: 2007-11-22 Last updated: 2009-04-02Bibliographically approved
List of papers
1. Molecular phylogeny and systematics of Polyblastia (Verrucariaceae, Eurotiomycetes) and allied genera
Open this publication in new window or tab >>Molecular phylogeny and systematics of Polyblastia (Verrucariaceae, Eurotiomycetes) and allied genera
2008 (English)In: Mycological Research, ISSN 0953-7562, E-ISSN 1469-8102, Vol. 112, no Part 11, p. 1307-1318Article in journal (Refereed) Published
Abstract [en]

Phylogenetic relationships of the lichen genus Polyblastia and closely related taxa in the family Verrucariaceae (Verrucariales, Chaetothyriomycetidae) were studied. A total of 130 sets of sequences (nuLSU rDNA, nuITS rDNA and RPB1 region A-D), including 129 newly generated sequences, were analysed. Phylogenetic relationships were inferred using a Bayesian approach based on two datasets. A first analysis of a larger, two-locus dataset (nuLSU and RPB1) for 128 members of the Verrucariaceae, confirmed the polyphyly of Polyblastia, Thelidium, Staurothele, and Verrucaria, as currently construed. The second analysis focused on 56 Polyblastia and allied taxa, but using an additional locus (nuITS rDNA) and two closely related outgroup taxa. The latter analysis revealed strongly supported groups, such as Polyblastia s. str., the Thelidium group (a mixture of Polyblastia, Thelidium, Staurothele and Verrucaria species). The genus Sporodictyon, which is here accepted, also accommodates Sporodictyon terrestre comb. nov. Morphological features traditionally used for characterizing Polyblastia, Thelidium, Staurothele and Verrucaria, such as spore septation and colour, occurrence of hymenial photobiont, involucrellum structure, and substrate preference, were found to be only partially consistent within the strongly supported clades, and thus are not always reliable features for characterizing natural groups.

Keywords
Cardinal characters, RPB1, Sporodictyon, Staurothele, Thelidium, Trimmatothele, Verrucaria
National Category
Biological Sciences
Identifiers
urn:nbn:se:uu:diva-96490 (URN)10.1016/j.mycres.2008.05.002 (DOI)000261368000004 ()
Available from: 2007-11-22 Created: 2007-11-22 Last updated: 2018-03-29
2. Taxonomy and species delimitation in Sporodictyon (Verrucariaceae) in Northern Europe and the adjacent Arctic – reconciling molecular and morphological data
Open this publication in new window or tab >>Taxonomy and species delimitation in Sporodictyon (Verrucariaceae) in Northern Europe and the adjacent Arctic – reconciling molecular and morphological data
2009 (English)In: Taxon, ISSN 0040-0262, E-ISSN 1996-8175, Vol. 58, no 2, p. 585-605Article 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.

Keywords
haplotype networks, MCMC, phylogeny, species recognition, split decomposition analysis, revision
National Category
Biological Sciences
Identifiers
urn:nbn:se:uu:diva-96491 (URN)000266525800022 ()
Available from: 2007-11-22 Created: 2007-11-22 Last updated: 2018-03-29
3. The main genera of Verrucariaceae (Ascomycota) as supported by recent morphological and molecular studies.
Open this publication in new window or tab >>The main genera of Verrucariaceae (Ascomycota) as supported by recent morphological and molecular studies.
Show others...
(English)In: TaxonArticle in journal (Refereed) Submitted
Identifiers
urn:nbn:se:uu:diva-96492 (URN)
Available from: 2007-11-22 Created: 2007-11-22 Last updated: 2018-03-29Bibliographically approved
4. Atla, a new genus in the Verrucariaceae (Verrucariales)
Open this publication in new window or tab >>Atla, a new genus in the Verrucariaceae (Verrucariales)
2008 (English)In: The Lichenologist, ISSN 0024-2829, E-ISSN 1096-1135, Vol. 40, no Part 4, p. 269-282Article in journal (Refereed) Published
Abstract [en]

The new genus Atla forms a well-supported clade in a molecular phylogeny based on the ITS1-5.8S-ITS2 and LSU regions of the nuclear ribosomal DNA. The genus has a crustose thallus, a hamathecium at maturity without hyphal elements except for pseudoparaphyses remaining at the ostiolum, and large, muriform spores. Atla wheldonii was previously referred to Polyblastia. Three new species, A. alpina (the type of the new genus), A. palicei and A. praetermissa, are included in the genus and described here as new to science. They were found on calcareous rocks and soil in Northern Scandinavia, A. alpina also occurs in Central Europe, and A. wheldonii likewise in Central Europe, the Pyrenees and in the British Isles. An identification key to the species and a revision of the genus are also provided.

Keywords
ascomycetes, lichens, molecular phylogeny, morphology, revision
National Category
Biological Sciences
Identifiers
urn:nbn:se:uu:diva-96493 (URN)10.1017/S0024282908007512 (DOI)000258047000001 ()
Available from: 2007-11-22 Created: 2007-11-22 Last updated: 2018-03-29

Open Access in DiVA

fulltext(793 kB)1356 downloads
File information
File name FULLTEXT01.pdfFile size 793 kBChecksum MD5
b3c2cf9496f767fa105bac92f4ffb38c4ec5cf616245cca87339d1d0347ca951006d0d13
Type fulltextMimetype application/pdf
cover(219 kB)55 downloads
File information
File name COVER01.pdfFile size 219 kBChecksum MD5
0164dced7602f9632e28957de37d2e3724ee382a5e6e4db32fd6940c807fcf4d8a78a8ef
Type coverMimetype application/pdf
Buy this publication >>

By organisation
Systematic Botany

Search outside of DiVA

GoogleGoogle Scholar
Total: 1356 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

isbn
urn-nbn

Altmetric score

isbn
urn-nbn
Total: 1563 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf