Membranous, rose-pink fronds, 20-200 (300) mm long, arising from a discoid base. Frond linear-lanceolate, with well-marked midrib and thin membranous margins, 1-5 (8) mm wide, repeatedly branched irregularly from midrib. Fronds with pointed apices, margins without microscopic veins, monostromatic except in midribs. 

Original publication: Collins, F.S. & Hervey, A.B. (1917). The algae of Bermuda. Proceedings of the American Academy of Arts and Sciences 53: 1-195, 6 pls.

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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.

Wynne, M.J. & Ballantine, D.L. (1986). The genus Hypoglossum Kützing (Delesseriaceae, Rhodophyta) in the tropical western Atlantic, including H. anomalum sp. nov. Journal of Phycology 22: 185-193, 25 figs.

Basionym: Fucus hypoglossoides Stackhouse

Lectotype locality: Polridmouth Cove, Cornwall, England Lectotype: CN (Maggs & Hommersand 1993: 195).