Description: Thallus in dense tufts with distinct terete main axes, erect to 36 cms long with 6 - 8 pericentral cells and heavily corticated. Clothed with dense tufts of ramuli. Cystocarps urceolate.

Habitat: Common. Epilithic, epizoic and epiphytic in pools of the mid-littoral and ublittoral to 8 m.

Distribution: Widespread around the British Isles from the Shetlands to the Channel Islands. Europe: Mediterranean, Portugal, Spain, France, Baltic Sea, Norway and the Faroes. Atlantic coast of North America: Canada. Further afield: Pacific coast North America, Australia and New Zealand.

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

iNaturalist: Polysiphonia brodiei at iNaturalist World Species Observations database.

WoRMS: Polysiphonia brodiei at World Register of Marine Species. Accepted name: Leptosiphonia brodiei (Dillwyn) A.M.Savoie & G.W.Saunders, 2019. AphiaID: 1340377.

Classification: Biota; Plantae; Biliphyta; Rhodophyta; Eurhodophytina; Florideophyceae; Rhodymeniophycidae; Ceramiales; Rhodomelaceae; Polysiphonieae; Polysiphonia