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Botanica Marina

Editor-in-Chief: Dring, Matthew

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A reclassification of Mycophycias ascophylli (Ascomycota) based on nuclear large ribosomal subunit DNA sequences

Jantina Toxopeus1 / Catherine J. Kozera2 / Stephen J.B. O’Leary2 / 1

1Department of Biology, St. Francis Xavier University, P.O. Box 5000, Antigonish NS, B2G 2W5, Canada

2NRC Institute for Marine Biosciences, 1141 Oxford St, Halifax NS, B3H 3Z1, Canada

Citation Information: Botanica Marina. Volume 54, Issue 3, Pages 325–334, ISSN (Online) 1437-4323, ISSN (Print) 0006-8055, DOI: 10.1515/bot.2011.032, May 2011

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Phylogenetic relationships of the fungal symbiont of two brown algae were evaluated in the context of host diversity using ribosomal large subunit (nuLSU) sequences. Phylogenetic analysis indicates that Mycophycias ascophylli (phycobionts Ascophyllum nodosum, Pelvetia canaliculata) is misclassified in Verrucariales (Eurotiomycetes). There was no evidence for speciation of M. ascophylli within its two hosts, nor evidence for geographic differentiation between the eastern and western Atlantic Ocean and the White Sea (Arctic Ocean). The placement of M. ascophylli in Capnodiales (Dothideomycetes) will require a reclassification of this species, and calls into question the current classification of the other species of Mycophycias, M. apophlaea.

Keywords: Capnodiales; Mycophycias ascophylli; phylogeny; ribosomal large subunit DNA; Verrucariales

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