On the systematic position of Tortella arctica and Trichostomum arcticum (Bryophyta, Pottiaceae)
A molecular-taxonomic study of Tortella artica and Trichostomum arcticum has been conducted using nrITS and cp trn L-F sequence data obtained from multiple specimens across most of their geographic range. Two taxa are recognized within the traditional concept of Trichostomum arcticum and both of them are included in the genus Tortella under the names T. spitsbergensis and Tortella × cuspidatissima. The evidence presented suggests that the latter is a hybrid between Tortella arctica and Tortella spitsbergensis. Tortella spitsbergensis and Tortella × cuspidatissima can be easily distinguished by the stem central strand, which is very well developed in T. spitsbergensis and weakly developed (or rarely absent) in T. × cuspidatissima. The generic boundaries of Tortella are discussed in connection with the closely related genera Oxystegus, Chionoloma, Pseudosymblepharis and Trichostomum. A key for these three arctic taxa is presented and their distribution and ecology are discussed.
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Document Type: Research Article
Publication date: May 1, 2014
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- Nova Hedwigia is an international journal publishing original, peer-reviewed papers on current issues of taxonomy, morphology, ultrastructure and ecology of all groups of cryptogamic plants, including cyanophytes/cyanobacteria and fungi. The half-tone plates in Nova Hedwigia are known for their high quality, which makes them especially suitable for the reproduction of photomicrographs and scanning and transmission electron micrographs.
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