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.

The two species currently recognised are Arthrothamnus bifidus and Arthrothamnus kurilensis.

This Phaeophyceae (or brown alga) article is a stub.