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Dictyonema coppinsii, a new name for the European species known as Dictyonemainterruptum (Basidiomycota: Agaricales: Hygrophoraceae), with a validation of its photobiont Rhizonema (Cyanoprokaryota: Nostocales: Rhizonemataceae)

Published online by Cambridge University Press:  12 May 2014

Robert LÜCKING ,
Fred R. BARRIE  and
David GENNEY
Robert LÜCKING
Affiliation:
Department of Botany, The Field Museum, 1400 South Lake Shore Drive, Chicago, Illinois 60605, USA. Email: rlucking@fieldmuseum.org
Fred R. BARRIE
Affiliation:
Department of Botany, The Field Museum, 1400 South Lake Shore Drive, Chicago, Illinois 60605, USA. Email: rlucking@fieldmuseum.org Missouri Botanical Garden, P.O. Box 299, St. Louis, MO 63166, USA
David GENNEY
Affiliation:
Scottish Natural Heritage, Great Glen House, Leachkin Road, Inverness, IV4 8NW, Scotland
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Abstract

The lichenized basidiomycete known as Dictyonemainterruptum is a widely distributed but rare, oceanic, western European species known from the British Isles, the Pyrenees, the Azores, and Madeira. Unfortunately, the name has never been validly published. The species was first described in the cyanobacterial genus Calothrix in 1833, which predates the starting point of heterocystous bacterial nomenclature, 1 January 1886. The epithet was never subsequently included in a validly published binomial and its combination into Dictyonema was therefore invalid as well. There was also controversy about whether the epithet applied to the cyanobacterial photobiont (as originally intended) or to the lichen fungus (as proposed later). Because of the lack of a valid description for this epithet, we have chosen to establish a new name, Dictyonema coppinsii Lücking, Barrie & Genney, for the lichenized fungus at hand, whereas the cyanobacterial photobiont is validated with the genus name Rhizonema Lücking & Barrie, adopting the epithet interruptum for it, and placed in a separate family, Rhizonemataceae Büdel & Kauff ex Lücking & Barrie.

Keywords

CalothrixIrelandlichensScotlandScytonemaStigonema
Type
Articles
Information
The Lichenologist , Volume 46 , Issue 3 , May 2014 , pp. 261 - 267
Copyright
Copyright © British Lichen Society 2014 

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