Description: Thallus large and erect in dense tufts of filaments to 20 cms long. All ramuli short and fine, in whorls clearly separated to the naked eye.

Habitat: Common especially on wave-exposed coasts. Low littoral and sublittoral to 20 m.

Distribution: A south-western species in the British Isles: south-west England, Wales, Ireland, Isle of Man and western Scotland also the Channel Islands. Europe: Portugal, Spain and the Baltic. Further afield: Canary Islands.

Similar Species: Halurus equisetifolius

Distribution Map from NBN: Sphondylothamnion multifidum at National Biodiversity Network mapping facility, data for UK.

iNaturalist: Sphondylothamnion multifidum at iNaturalist World Species Observations database.

WoRMS: Sphondylothamnion multifidum at World Register of Marine Species. Accepted name: Sphondylothamnion multifidum (Hudson) Nägeli, 1862. AphiaID: 144705.

Classification: Biota; Plantae; Biliphyta; Rhodophyta; Eurhodophytina; Florideophyceae; Rhodymeniophycidae; Ceramiales; Wrangeliaceae; Sphondylothamnieae; Sphondylothamnion