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Description: |
Delicate, linear, membranous, purple-brown fronds, 20-40 mm (-200) mm long and 5-10 (-25) mm broad, usually simple with short stipe from basal holdfast; orange patches when reproductive. Key characteristics: Winter occurrence; high-hore habitat; narrow strap-like fronds. Original publication: Greville, R.K. (1830). Algae britannicae, or descriptions of the marine and other inarticulated plants of the British islands, belonging to the order Algae; with plates illustrative of the genera. pp. [i*-iii*], [i]-lxxxviii, [1]-218, pl. 1-19. Edinburgh & London: McLachlan & Stewart; Baldwin & Cradock.
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Taxonomic notes: According to Guiry (1997) this species requires taxonomic reinvestigation. |
| Name History |
Adjective (Latin), linear |
| Biogeography |
Recorded throughout Northern Europe, from Norway to Portugal, Azores. Canada (Labrador) to USA (at least Connecticut). In Portugal: New record for Beira Litoral, collected in Barra de Aveiro in 1997 and Buarcos in 2003 (PDF link). |
| Uses and compounds |
Direct use as food - food, consumed whole The genus Porphyra is the second major seaweed crop, from aquaculture, worldwide, commercially known as “nori”. It is used mainly as ingredient on the Japanese delicacy “Sushi” but in Asian countries is also commonly used in soups and salads. Porphyra is rich in protein (up to 50% dry weight), vitamin C and several important amino acids. No references to the use of Porphyra linearis. |
| References |
Bates, C.R., Saunders, G.W. & Chopin, T. (2005). An assessment of two taxonomic distinctness indices for detecting seaweed assemblage responses to environmental stress. Botanica Marina 48: 231-243. 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. Müller, K.M., Cannone, J.J. & Sheath, R.G. (2005). A molecular phylogenetic analysis of the Bangiales (Rhodophyta) and description of a new genus and species, Pseudobangia kaycoleia. Phycologia 44: 146-155. 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. Varela-Alvarez, E., Stengel, D.B. & Guiry, M.D. (2004). The use of image processing in assessing conchocelis growth and conchospore production in Porphyra linearis. Phycologia 43: 282-287. Varela-Alvarez, E., Stengel, D.B. & Guiry, M.D. (2007). Seasonal growth and phenotypic variation in Porphyra linearis (Rhodophyta) populations on the west coast of Ireland. Journal of Phycology 43: 90-100. Varela-Álvarez, E., Stengel, D.B., Rindi, F. & Guiry, M.D. (2005). Alternation of nuclear phases and chromosome numbers in Porphyra linearis (Bangiales, Rhodophyta) from western Ireland and Maine, USA. Phycologia 44: 61-65. Yoshida, T., Notoya, M., Kikuchi, N. & Miyata, M. (1997). Catalogue of species of Porphyra in the world, with special reference to the type locality and bibliography. Nat. Hist. Res. Special Issue No. 3: 5-18, 4 figs |
| Habitat: |
Marine Species, zone-forming on rock in the upper intertidal and splash zone of semi-exposed and exposed shores, generally distributed; a winter and spring annual appearing on semi-exposed and exposed |
| Type information: |
Type locality: Peakhead near Sidmouth, Devon, England Lectotype: R.K. Greville; Spring; E (Brodie & Irvine 2003: 124). |
