Lomentaria articulata (Hudson) Lyngbye
Description: Soft, cylindrical, crimson to brownish red fronds, to 200 mm (normally much shorter). Lighter when wet (above), darker when dry (below). Much branched, axes constricted into bead-like portions, ramuli at nodes, often whorled. Base of creeping rhizoidal filaments.
Habitat: On rocks and stones, in pools, lower intertidal and subtidal, generally distributed, sometimes almost zone-forming, frequent.
Distribution: Widely distributed in Britain and Ireland.
Similar species: None in Britain and Ireland, although Lomentaria hakodatensis, introduced into Brittany from Japan, is similar. Lomentaria clavellosa and Lomentaria orcadensis are both distinctly flattened and mostly branched in one plane.
Link: AlgaeBase