Thallus with prostate and erect axes, the erect ones flat-compressed and with distichous alternate pinnate branching; brownish-red colour, flexible and cartilaginous texture; attached by rhizoids which form discoid adhesive structures.

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Cullinane, J.P., Egan, B. & Whelan, P. (1980). Most northern fruiting record of Pterosiphonia complanata (Clem.) Falkenb. on the Atlantic coast. Irish Naturalists' Journal 20: 140-141.

Cullinane. J.P., Egan, B. and Whelan, P. (1980). Most northern fruiting record of Pterosiphonia complanata (Clem.) Falkenb. on the Atlantic coast . Irish Naturalists' Journal 20: 140-141.

Diaz Tapia, P. & Bárbara, I. (2011). Sexual structures in Ptilothamnion sphaericum and Pterosiphonia complanata (Ceramiales, Rhodophyta) from the Atlantic Iberian Peninsula. Botanica Marina 54(1): 35-46.

Norton, T.A. & Parkes, H.M. (1972). The distribution and reproduction of Pterosiphonia complanata. British Phycological Journal 7: 13-19.

Basionym: Fucus complanatus Clemente

Type locality: "Cir. Tarifa" [Cádiz, Andalusia, Spain] (Roxas Clemente y Rubio 1807: 316). Lectotype: MA Algae 1464 (Cremades 1993: fig. 4b).