The thallus is 10-21 cm high, reddish brown in colour, with the primary erect axis initially arising from a discoid holdfast to 4 mm diam., subsequently further erect axes arising from the same holdfast giving a clumped appearance. Short creeping branchlets are produced from the lowermost parts of erect axes, and become attached to the substrate by small rhizoidal haptera about 0'5 mm diam. The thallus branching is irregularly radial, erecto-patent with three to four orders of
branching, ultimate branches arising every two to six (eight) axial cells. Ultimate branchlets are 250-500 μm diam., the variation being a reflection of the robustness of the plant (Gordon-Mills, 1987).

Original publication: Agardh, C.A. (1817). Synopsis algarum Scandinaviae, adjecta dispositione universali algarum. pp. [i]-xl, [1]-135. Lundae [Lund]: ex officina Berlingiana.

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Dawes, C.J. & Mathieson, A.C. (2008). The seaweeds of Florida. pp. [i]- viii, [1]-591, [592], pls I-LI. Gainesville, Florida: University Press of Florida.

Loiseaux-de Goër, S. & Noailles, M.-C. (2008). Algues de Roscoff. pp. [1]-215, col. figs. Roscoff: Editions de la Station Biologique de Roscoff.

Maggs, C.A. & Hommersand, M.H. (1993). Seaweeds of the British Isles. Volume 1. Rhodophyta. Part 3A. Ceramiales. pp. xv + 444, 129 figs, map. London: HMSO.

N'Yeurt, A.D.R. & Payri, C.E. (2010). Marine algal flora of French Polynesia III. Rhodophyta, with additions to the Phaeophyceae and Chlorophyta. Cryptogamie Algologie 31: 3-205.

Basionym: Fucus dasyphyllus Woodward

Lectotype locality: Yarmouth, Norfolk, England (Silva, Basson & Moe 1996: 481).

Neotype: BM-K (Maggs & Hommersand 1993: 390). Notes:

Type locality recorded by Maggs & Hommersand (1993: 390) as Essex (Yarmouth); undated, Turner.

Syntype localities: Cromer and Yarmouth, Norfolk, England (South & Skelton, 2003).