Abstract
The taxon currently known asSargassum sagamianum is shown to include forms that are distinguishable from each other at specific level.S. sagamianum Yendo (sensu stricto) has a conical holdfast, branched upright stem, main branches triquetrous with sharp edges, leaves with sparsely serrate margins, and triquetrous female receptacles which mature in autumn.S. yamadae Yoshida et T. Konno spec. nov. has a creeping stem adhering to the substratum by attaching discs forming later a solid discoid holdfast, and simple spatulate receptacles which mature in spring to early summer.S. okamurae Yoshida et T. Konno spec. nov. is characterized by a creeping stem adhering by small attaching discs, its flat branches, linear lanceolate leaves with entire margins, and forked receptacles which mature in late autumn.S. yezoense (Yamada) Yoshida et T. Konno stat. nov. is considered as a distinct species with its creeping stem with a few attaching discs, its leaves not retroflexed, by its main branch having rounded edges, and simple spatulate receptacles maturing in summer.
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