Note on the Species of Ceramium (Ceramiace Rhodophyta) from Ullungdo Island, Korea

The taxonomic note was given to the species of Ceramium from Ullungdo Island. Five species, Ceramium aduncum Nakamura, C. codii (Rhichards) G. Mazoyer, C. flaccidum (Harvey exK tzing) Ardissone, C. paniculatum Okamura, and C. tenerrimum (Martense) Okamura were collected during this study. C. aduncum was collected in the intertidal and upper subtidal zones from December to Feburary. They had a narrow internodal space showing 1/3-1/5 times as large as nodal band. C. codii had the spermatangial mother cells developed on abaxial cortical cells of cortical band C. paniculatum collected in summer and winter had a creeping thallus and alternative branching type in gross morphology. The axial cell of C. flaccidum showed 2.3-2.8 L/B ratio, smaller than those of plants from Chejudo Island.