Description: Thallus filamentous, densley branched and erect to 30 cms, Main axis polysiphonous with 7 pericentral cells and fine monosiphonous lateral branches.

Habitat: Epilithic and epiphytic, sublittoral to 30 m.

Distribution: Widely distributed around the British Isles including the Shetlands and Channel Islands. Europe: Mediterranean, Portugal, Atlantic coasts of Spain and France, Baltic Sea, Norway and the Faroes.

Similar Species: Dasya is similar but the main branches are corticate to some degree.

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

iNaturalist: Brongniartella byssoides at iNaturalist World Species Observations database.

WoRMS: Brongniartella byssoides at World Register of Marine Species. Accepted name: Vertebrata byssoides (Goodenough & Woodward) Kuntze, 1891. AphiaID: 631828.

Classification: Biota; Plantae; Biliphyta; Rhodophyta; Eurhodophytina; Florideophyceae; Rhodymeniophycidae; Ceramiales; Rhodomelaceae; Lophothalieae; Brongniartella