Species:

Note: The species is common in the intertidal zone during summer at relatively wave-exposed sites. The dark brown thallus can become up to 50 cm long, and has a main axis with numerous first order branches. The innermost part is composed of a multiaxial syntagma, interwoven by thin hyphae-like structures. The thallus surface consists of assimilatory filaments set very close together. Each filament consists of 6-8 cells, the outermost cell having a spherical shape.