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The marine algal vegetation of spring season in the intertidal belt of Jeju Island, Korea, was carried out by the quadrat method at 4 transects; Moseulpo, Kangjeong, Whabug, and Hado in 1976. The transects were divided into 5 stations by exposed frequencies of the substratum from water, such as more than 50%, 46-49%, 28-45%, 7-27%, and less than 6%. As a result, the algal vegetations were separated into three groups, high, middle and low algal communities. The representative dominant species of each group are as follows. High algal community: Porphyra suborbiculata, Bangia fusco-purpurea, Gloiopeltis furcata. Middle algal community: Ishige okamurai, Hizikia fusiforme, Corallina pilulifera, Sargassum thunbergii. Low algal community: Sargassum ringgoldianum, Sarg. confusum. The coverage of these groups is 43.5%, 57.6%, and 77.3%, respectively.
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