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Although in the discussions of the geographic distribution of the marine algae in the western part of the North Pacific, the marine algal flora of this vast area has been variously divided by phycologist, there is, as yet, not a single satisfactory system for its regional division since in some cases the proposed floristic regions are too large and inclusive resulting in their heterogenous nature and in other cases, they are too minute or classified according to their political nature. In the present paper, an attempt is made to propose a system of objectively dividing this vast area into a number of major fioristic regions, based on the following two principles;
Although in the discussions of the geographic distribution of the marine algae in the western part of the North Pacific, the marine algal flora of this vast area has been variously divided by phycologist, there is, as yet, not a single satisfactory system for its regional division since in some cases the proposed floristic regions are too large and inclusive therefore in their heterogenous nature and in other cases, they are too minute or classified according to their political nature. In the present paper, an attempt is made to propose a system of objectively dividing this vast area into a number of major fioristic regions, based on the following two principles;