Original publication: Agardh, C.A. (1824). Systema algarum. pp. [i]-xxxviii, [1]-312. Lundae [Lund]: Literis Berlingianis.
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High antioxidant activity (Zubia et al. 2009)

Braune, W. (2008). Meeresalgen. Ein Farbbildführer zu den verbreiteten benthischen Grün- Braun- und Rotalgen der Weltmeere. pp. [1]-596, 266 pls. Ruggell: A.R.G. Gantner Verlag.

Klein, A.S, Mathieson, A.C., Neefus, C.D., Cain, D.C., Taylor, H.A., Teasdale, B.W., West, A.L., Hehre, E.J., Brodie, J., Yarish, C. & Wallace, A.L. (2003). Identification of north-western Atlantic Porphyra (Bangiaceae, Bangiales) based on sequence variation in nuclear SSU and plastid rbcL genes. Phycologia 42: 109-122, 3 figs, 5 tables.

Lindstrom, S.C. & Fredericq, S. (2003). rbcL gene sequences reveal relationships among north-east Pacific species of Porphyra (Bangiales, Rhodophyta) and a new species, P. aestivalis. Phycological Research 51(3): 211-224.

Teasdale, B.W., West, A., Klein, A.S. & Mathieson, A.C. (2009). Distribution and evolution of variable group-I introns in the small ribosomal subunit of North Atlantic Porphyra (Bangiales, Rhodophyta). European Journal of Phycology 44(2): 171-182, 3 figs, 5 tables.

Basionym
Ulva purpurea Roth

Type information
Neotype locality: Nord-Ost Watt, Helgoland (Brodie & Irvine 1997: 769). Neotype: A. Wagner; 17 October 1996; BM (Brodie & Irvine 1997: 769). Notes: The original material, now lost, was collected at Eckwarden, Niedersachsen, Germany.