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ALGAE > Volume 21(4); 2006 > Article
ALGAE 2006;21(4): 417-423. doi: https://doi.org/10.4490/algae.2006.21.4.417
Morphology and Molecular Phylogeny of Hypnea flexicaulis (Gigartinales, Rhodophyta) from Korea
Paul John L. Geraldino, Eun Chan Yang and Sung Min Boo*
Department of Biology, Chungnam National University, Daejeon 305-764, Korea
Morphology and molecular phylogeny of a red algal species, Hypnea flexicaulis that is recently described from Japan, were investigated based on 23 collections from Korea (21), Taiwan (1), and the Philippines (1). Hypnea flexicaulis has percurrent axes with flexuous, antler-like branches which have wide branching angles, and abaxially curved ultimate branchlets. In order to study DNA divergence and phylogenetic relationships of the species, we determined plastid rbcL and mitochondrial cox1 sequences from the 23 collections. All 21 specimens from five different locations in Korea were almost identical to H. flexicaulis from Japan in rbcL sequences. Although there was a difference of three to five base pairs (bp) between samples from Korea and the Philippines or between the Philippines and Taiwan, Bayesian analyses of the rbcL data showed that all specimens from Korea, Japan, the Philippines, and Taiwan were strongly monophyletic. However, it is interesting that specimens from the Philippines differed by 31- 34 base pairs in mitochondrial cox1 gene from those of materials from Korea and Taiwan, which differed by one to seven bp in rbcL between them. Although H. boergesenii is different from H. flexicaulis in having many antler-like branchlets, both appeared as sisters in all analyses of the rbcL data. This is the first report of H. flexicaulis from Korea based on morphology, rbcL, and cox1 gene sequences
Key words: cox1, Hypnea, H. flexicaulis, morphology, phylogeny, rbcL, taxonomy

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