• ALGAE
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• 제19권3호
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• pp.153-160
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• 2004

The intergeneric relationship of Staurastrum complex including genus Arthrodesmus and Xanthidium was studied on the basis of mitochondrial coxⅢ sequence variation. Teiling's suggestion that Staurodesmus was an independent genus apart from genus Staurastrum, Arthrodesmus and Cosmarium was also reevaluated. The phylogeny inferred from coxⅢ gene was not consistent with morphological characteristics of Staurastrum complex. Genus Staurastrum was closely related to genus Xanthidium in the phylogenetic analysis of coxⅢ, but distant to genus Staurodesmus. The taxonomic treatment of genus Staurodesmus as an independent entity could not be determined, because Staurodesmus did not firm a monophyletic Glade. Therefore, genus Staurodesmus could not be treated as an independent genus as Prescott et al. (1982) claimed.

• ALGAE
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• 제20권4호
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• pp.261-270
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• 2005

We analyzed chloroplast ATP synthetase beta subunit(atpB) sequences from 32 strains of the zygnemophycean green algae, Staurastrum, Staurodesmus, and a single species of Xanthidium. A total of 42 atpB sequences including previously published ones was aligned for phylogenetic analyses. The phylogenies were validated with bootstrap analysis and Kishino-Hasegawa test. Taxa of Staurastrum excluding S. muticum indicate that they can be characterized by taxa having the ornamented cell wall or the process of cells. However, the genus Staurodesmus was grouped with taxa having the smooth cell wall and the absence of process or arms. The results suggest that the genus Staurodesmus could be extended to include Staurastrum muticum, Desmidium, Onychonema and Xanthidium. Further taxon sampling of Staurodesmus and putative relatives is necessary for a solid classification of the genus.

• ALGAE
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• 제22권1호
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• pp.1-10
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• 2007

To gain insights into the phylogenetic relationships of genus Staurastrum and Staurodesmus, we analyzed nuclearencoded small subunit rDNA of 82 strains, and chloroplast atpB gene sequences of 44 strains belonging to three genera (Staurastrum, Staurodesmus, Cosmarium). Excluding the Staurastrum muticum and S. orbiculare, forty five strains of genus Staurastrum formed a well supported clade. It was shown that with no cell wall sculpture and processes, these two species have a strong phylogenetic relationship with genus Staurodesmus. Therefore, it is strongly recommended to transfer Staurastrum without processes and cell wall sculpture into Staurodesmus. S. obsoletus is a taxa that is transferred from Cosmarium. But, from this study, it has shown a phylogenetic relationship with Cosmarium. Therefore, this species is strongly recommended to transfer back to Cosmarium instead of Staurodesmus. As it was studied before, genus Staurastrum has shown monophyletic. Since the genus taurodesmus groups with Cosmarium, they were shown to be polyphyletic.

• 환경생물
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• 제36권3호
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• pp.285-290
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• 2018

Six taxa of unrecorded Korean species of charophytes are described. Freshwater and aerial charophytes were collected from the bark of trees, reservoirs, small ponds and swamps from April 2017 to September 2017. The newly recorded species of Korea were Cosmarium quadrifarium f. octastichum, Euastrum turneri, Spondylosium nitens var. triangulare, Staurastrum kouwetsii, Staurodesmus dickiei var. latus, and Klebsormidium subtile. K. subtile was transferred from Stichococcus subtilis.