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The genus  Polysiphonia  Greville is characterized by having four ecorticated pericentral cells, rhizoids in open connection with the pericentral cells, four-celled carpogonial branches, spermatangial branches replacing the whole trichoblast, and tetrasporangia in straight series.  Polysiphonia dokdoensis  sp. nov. collected from Dokdo, Korea is here described as a new species on the basis of morphological and molecular data.  Polysiphonia dokdoensis  is characterized by having four ecorticated pericentral cells, unicellular rhizoids in open connection with pericentral cells, scar cells placed between two pericentral cells, an alternating arrangement of unilateral branch pairs, and tetrasporangia in straight series. The alternating arrangement of unilateral branch pairs and the placement of the scar cell between two pericentral cells are recognized as main characters to identify  P. dokdoensis .  Polysiphonia dokdoensis  is morphologically identical to “ P. atlantica ” sensu Kim and Lee, which is now recognized as  P. dokdoensis  sp. nov. and distinguished from the authentic European  P. atlantica  by the distinguishing morphological character states. Phylogenetic analyses of  rbc L confirm the placement of the new taxon as a distinct species in  Polysiphonia  sensu stricto .

botanica marina

Polysiphonia dokdoensis  sp. nov. (Rhodomelaceae, Ceramiales) based on a population previously known as  Polysiphonia atlantica  sensu Kim and Lee from Korea