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Algae > Volume 16(4); 2001 > Article
Algae 2001;16(4): 411-420.
Phylogenetic Relationships of the Dasyaceae (Ceramiales, Rhodophyta) Based on Anatomical Characters
Han-Gu Choi
School of Biological Sciences, Seoul National University
The aim of the current cladistic analysis was to evaluate the phylogenetic relationships among the 13 genera of the Dasyaceae based on 20 anatomical characters. The results indicated that the Dasya-group (Dasya, Dasysiphonia, Eupogodon and Rhodoptilum) and the Heterosiphonia-group (Heterosiphonia, Dictyrus and Thuretia) would form the two distinct lineages in the Dasyaceae. The former shares the several important diagnostic features: the presence of monosiphonous pseudolateral branches, adventitious branches and post-sporangial cover cells as well as procarps formed on the indeterminate branches, and the absence of pericarp initials before fertilization, whereas the latter has the alternative features for them: having mono-/polysiphonous pseudolateral branches, the absence of adventitious branches, and the formation of presporangial cover cells, the presence of procarps formed on the determinate branches and pericarp initials before fertilization. The phylogenetic relationships among the 13 genera within the Dasyaceae were discussed.
Key words: anatomical characters, Ceramiales, cladistic analysis, Dasya-group, Dasyaceae, Heterosiphonia-group, Rhodophyta, systematics

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