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A contribution to the taxonomy of the genus Rinodina (Physciaceae, lichenized Ascomycotina) using combined ITS and mtSSU rDNA data

Published online by Cambridge University Press:  03 August 2010

Olga NADYEINA
Affiliation:
M. G. Kholodny Institute of Botany, National Academy of Sciences of Ukraine, Tereschenkivs'ka 2, 01601 Kyiv, Ukraine. Email: nadyeina@gmail.com
Martin GRUBE
Affiliation:
Institute of Plant Sciences, Karl-Franzens-Universität Graz, Holteigasse 6, A-8010 Graz, Austria.
Helmut MAYRHOFER
Affiliation:
Institute of Plant Sciences, Karl-Franzens-Universität Graz, Holteigasse 6, A-8010 Graz, Austria.

Abstract

To test the phylogenetic position of phenotypically peculiar species in the Physciaceae we generated 47 new sequences (26 of nrITS region and 21 of mtSSU rDNA) from 19 crustose taxa of Physciaceae mainly from the genus Rinodina. Phylogenetic analysis confirmed the Buellia and Physcia groups. The analysis revealed a considerable variability of characters traditionally used for classification, especially in the delimitation of the genera Buellia and Rinodina. While ascus types agree well with the distinction of the Buellia and Physcia groups, none of the other traditional characters, including excipulum type and ascospore thickening, were consistent within subclades of the Physcia group. We suggest that both excipulum type and ascospore characters are rather dynamic in the evolution of Rinodina species and only appear consistent in morphologically more complex foliose and fruticose groups, which are characterized by thallus characters not present in the crustose groups. Two recent taxonomic changes are supported by molecular characters: Endohyalina insularis (syn. ‘Rinodina’ insularis) and Rinodina lindingeri (syn. ‘Buellia’ lindingeri). In addition Rinodina parvula (syn. ‘Buellia’ parvula) is reinstated. New records for Endohyalina brandii, E. diederichii, E. insularis and Rinodina albana are presented.

Type
Research Article
Copyright
Copyright © British Lichen Society 2010

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