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Plant Biol (Stuttg) 2000; 2(3): 350-360
DOI: 10.1055/s-2000-3703
Original Paper
Georg Thieme Verlag Stuttgart ·New York

The Phylogeny of the Families Lecanoraceae and Bacidiaceae (Lichenized Ascomycota) Inferred from Nuclear SSU rDNA Sequences

S. Ekman 1 , M. Wedin 2, 3
  • 1 Department of Botany, University of Bergen, Bergen, Norway
  • 2 Botany Department, The Natural History Museum, London SW7 5BD, United Kingdom
  • 3 Present address: Department of Ecology and Environmental Science/BMG, Umeå University, Umeå, Sweden
Further Information

Publication History

December 15, 1999

January 26, 2000

Publication Date:
31 December 2000 (online)

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Abstract

The phylogeny of the families Lecanoraceae and Bacidiaceae (Lecanorales, Ascomycota) was investigated using 29 nuclear small subunit ribosomal DNA sequences, 9 of which were newly determined. The data set contained 368 variable characters, 234 of which were parsimony-informative. Phylogenetic estimations were performed with maximum parsimony and maximum likelihood optimality criteria. In the most parsimonious and most likely reconstructions, the Bacidiaceae sensu Hafellner 1988 forms a monophyletic group and the Lecanoraceae sensu Hafellner a paraphyletic group. The genera Tephromela and Scoliciosporum appear to belong outside these families. However, the hypothesis that the Lecanoraceae sensu Hafellner is monophyletic cannot be rejected, as indicated by a Kishino-Hasegawa test. Three hypotheses were rejected by Kishino-Hasegawa tests, viz. (1) that the Lecanoraceae and Bacidiaceae together form a monophyletic group; (2) that both the Lecanoraceae (incl. Scoliciosporum) and Bacidiaceae (incl. Tephromela) are monophyletic; and (3) that the ascus apex anatomy reflects phylogeny. The suborder Lecanorineae is paraphyletic unless the Stereocaulaceae and Cladoniaceae are included. One or both of the Bacidia and Lecanora types of ascus have probably evolved at least twice.

Key words

Lichens - Lecanorales - Lecanoraceae - Bacidiaceae - ribosomal DNA - molecular phylogeny - ascus

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 S. Ekman

Department of Botany University of Bergen

Allégaten 41 5007 Bergen Norway

Email: stefan.ekman@bot.uib.no

Section Editor: H. M. Jahns