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Description: |
Flattened, leafy, purple-crimson fronds, to 300 mm long. Cylindrical stipe continues as midrib of elliptical or ovate blade, membranous and monstromatic except for pinnate paired lateral veins extending into lobes of blade. Marginal lobes grow into secondary blades, which may in turn develop tertiary blades,each sinuate or lobed like oak leaf. Margin sinuous, toothed or drawn out into slender, repeatedly divided processes. A small red alga, up to 15 cm tall, with a leaf-like frond, with midrib, lateral veins and serrated margin that give the impression of an oak leaf. The disc-like holdfast gives rise to a short toughened stipe. In winter the frond wears away due to a combination of cessation of growth and wave action, leaving just the mid-rib, the blade growing back in spring. Phycodrys rubens is light crimson in colour and can be distinguished from the similarly leaf-like Delesseria sanguinea by the deeply serrated frond and branching habit. Link for MarLIN Original publication: Batters, E.A.L. (1902). A catalogue of the British marine algae. Journal of Botany, British and Foreign 40(Supplement): 1-107.
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| Name History |
Participle (Latin), reddish |
| 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. Gagnon, P., Johnson, L.E. & Himmelman, J.H. (2005). Kelp patch dynamics in the face of intense herbivory: stability of Agarum clathratum (Phaeophyta) stands and associated flora on urchin barrens. Journal of Phycology 41: 498-505. Larsen, A. & Sand-Jensen, K. (2005). Salt tolerance and distribution of estuarine benthic macroalgae in the Kattegat-Baltic Sea area. Phycologia 45: 13-23. 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. & Heine, J.N. (1992). Collections of marine red algae from St. Matthew and St. Lawrence Islands, the Bering Sea. Nova Hedwigia 55: 55-97. |
| Habitat: |
Marine species, on rock or epiphytic, especially on Laminaria hyperborea stipes, lower intertidal pools and subtidal, generally distributed, common |
| Common names: |
English: Sea Oak
Frensh: Algue feuille de chêne |
| Type information: |
Basionym: Fucus rubens Linnaeus Type locality: unlocalised (“in Oceano”) (Athanasiadis 1996: 114). Holotype: undated; L 910.128.1044 Notes: Dixon, 1964, fig. 1 |
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