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ITS sequence data suggest variability of ascus types and support ontogenetic characters as phylogenetic discriminators in the Agyriales (Ascomycota)

Published online by Cambridge University Press:  21 May 2001

H. Thorsten LUMBSCH ,
Imke SCHMITT ,
Heidi DÖRING  and
Mats WEDIN
H. Thorsten LUMBSCH
Affiliation:
Botanisches Institut, Universität Essen, 45117 Essen, Germany. E-mail: lumbsch@uni-essen.de
Imke SCHMITT
Affiliation:
Botanisches Institut, Universität Essen, 45117 Essen, Germany. E-mail: lumbsch@uni-essen.de
Heidi DÖRING
Affiliation:
Department of Botany, The Natural History Museum, Cromwell Road, London SW7 5BD, UK. Present address: Lehrstuhl für Pflanzensystematik, Universität Bayreuth, 95447 Bayreuth, Germany.
Mats WEDIN
Affiliation:
Department of Botany, The Natural History Museum, Cromwell Road, London SW7 5BD, UK. Present address: Department of Ecology and Environmental Science, Umeå University, SE-901 87 Umeå, Sweden.
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Abstract

The phylogeny of the Agyriales was investigated using nucleotide sequences of ITS1, 5.8S, and ITS2 rDNA. Sequences of these regions from 15 new sequences of 13 agyrialean fungi were aligned to those of four representatives of Ostropales used as outgroup. Six different alignments were analysed cladistically using maximum parsimony. The Agyriales were supported as a monophyletic group in the strict consensus tree and the synonymy of the Rimulariaceae and Saccomorphaceae was confirmed. The Schaereriaceae is also shown to belong to the Agyriaceae. The distribution of selected characters in the Agyriales is investigated and it is shown that the ascus type is variable within the group, while the ascoma ontogeny is invariant within the Agyriaceae. Trapelia as usually circumscribed is polyphyletic. The T. geochroa group is not closely related to Trapelia s. str. and the new genus Ainoa is described to accommodate T. geochroa and T. mooreana.

Type
Research Article
Information
Mycological Research , Volume 105 , Issue 3 , March 2001 , pp. 265 - 274
Copyright
© The British Mycological Society 2001

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