Arthrothamnus

{{Short description|Genus of seaweeds}}

{{no footnotes|date=March 2013}}

{{Automatic taxobox

| image = FMIB 41731 Arthropthamnus bifidus.jpeg

| image_caption = Arthrothamnus bifidus

| taxon = Arthrothamnus

| authority = Ruprecht, 1848

}}

Arthrothamnus is a genus of brown alga comprising approximately 2 species. It includes the algae commonly known as nekoashi-kombu, oarweed and chishima-nekoashi-kombu. Bifurcariopsis reproduces by means of conceptacles; it produces tetraspores and dispores and carpospores.