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The taxonomy of the Caloplaca citrina group (Teloschistaceae) in the Black Sea region; with contributions to the cryptic species concept in lichenology

Author:
  • Jan Vondrak
  • Pavel Riha
  • Ulf Arup
  • Ulrik Sochting
Publishing year: 2009
Language: English
Pages: 571-604
Publication/Series: Lichenologist
Volume: 41
Document type: Journal article
Publisher: Cambridge University Press

Abstract english

A new taxonomy of the Caloplaca citrina group in the Black Sea region is presented. It is based on the nrDNA ITS molecular data, chemistry (anthraquinone contents) and 20 morphological characters. Six species previously known in the region are accepted: Caloplaca arcis, C. calcitrapa, C. dichroa, C. flavocitrina, C. geleverjae, C. limonia. Five new species are described: Caloplaca arcisproxima, C. austrocitrina, C. communis, C. confusa and C. nigromarina. Seven further species, Caloplaca britannica, C. citrina, C. marina, C. maritima, C. microthallina, C. ora and C. phlogina are also treated briefly. Some maritime species known from the Atlantic coast of Europe are absent from the region, and, surprisingly, Caloplaca citrina s. str. could not be confirmed from the study area. A key to the species present in the region is provided, although morphological characters are of very limited value in this group. The variability and taxonomic importance of particular features are discussed. No significant differences in secondary chemistry were observed among the species. Many examples of convergence and some semi-cryptic species were revealed by molecular data. The term 'semi-cryptic species' is introduced here into lichenology for those species which cannot be clearly diagnosed by their morphology, but which are determined by other characters, mainly by their ecology and distribution. We propose to describe formally such species, in spite of difficulties with subsequent morphological identification.

Keywords

  • Botany
  • semi-cryptic species
  • Teloschistales
  • nrDNA ITS
  • lichens
  • alveolate cortex
  • Caloplaca citrina clade

Other

Published
  • ISSN: 0024-2829
Ulf Arup
E-mail: ulf [dot] arup [at] biol [dot] lu [dot] se

Researcher

Botanical collections

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Research group

Plant Biology

Caloplaca