Polyides rotunda ( )
Polyides rotunda (Hudson) Gaillon Finavarra, Co. Clare, Ireland; plants in sandy MLWN pools
© Michael Guiry (email@example.com)
Polyides rotunda (Hudson) Gaillon 1828: 365 (as 'Rotunda' )
Published in: Gaillon, B. (1828). Résumé méthodique des classifications des Thalassiophytes. Dictionnaire des Sciences Naturelles [Levrault] 53: 350-406, Tables 1-3.
Status of name
This name is of an entity that is currently accepted taxonomically.
Fucus rotundus Hudson
Type locality: St Ives, Cornwall, England (Dixon & Irvine 1977: 179). Lectotype: Hudson’s description based on herb. Sherard 1906, OXF (Dixon & Irvine 1977: 179). Notes: See also Drew (1958, pl. 61).
Origin of species name
Adjective (Latin), almost circular, with length breadth ratio of about 6 to 5 (Stearn 1973).
Fucus caprinus Gunnerus 1766
Fucus furcellatus Mohr 1786
Fucus radiatus Goodenough & Woodward 1797
Polyides lumbricalis C.Agardh 1822
Polyides rotunda f. typica Kjellman 1883
Polyides caprina (Gunnerus) Papenfuss 1950
This is a marine species.
(as Polyides rotunda (Hudson) Gaillon)
English: Discoid Forked Weed (Bunker et al. 2010).
Swedish: Klyving (Tolstoy & Österlund 2003).
(as Polyides caprina (Gunnerus) Papenfuss)
English: Goat tang (Dickinson 1963).
Cartilaginous, cylindrical, brownish red (drying black) fronds, to 200 mm high, in tufts from basal disc to 10 mm diam. Fronds 1-2 mm thick, undivided for some distance, then regularly and repeatedly dichotomously branched, axils rounded, apices pointed.
On rocks and stones in open sandy pools and runnels, lower intertidal and shallow subtidal, widely disrtibuted, common.
Furcellaria lumbricalis from which it many be distinguished by the absence of a rhizoidal base, wider branching angles (i.e. more fan-shaped), and that the fronds are red when held up to the light.
Athanasiadis, A. (2016). Phycologia Europaea Rhodophyta Vol. I. pp. [i]-xxxxviii, 1-762. Thessaloniki: Published and distributed by the author.
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.
Braune, W. (2008). Meeresalgen. Ein Farbbildführer zu den verbreiteten benthischen Grün- Braun- und Rotalgen der Weltmeere. pp. -596, pls 1-266 (colour photographs). Ruggell: A.R.G. Gantner Verlag.
Dixon, P.S. & Irvine, L.M. (1977). Seaweeds of the British Isles. Volume 1. Rhodophyta. Part 1. Introduction, Nemaliales, Gigartinales. pp. [i]-xi, -252, 90 figs. London: British Museum (Natural History).
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, -218, pl. 1-19. Edinburgh & London: McLachlan & Stewart; Baldwin & Cradock.
Loiseaux-de Goër, S. & Noailles, M.-C. (2008). Algues de Roscoff. pp. -215, col. figs. Roscoff: Editions de la Station Biologique de Roscoff.
Rao, C.S.P. (1956). The life-history and reproduction of Polyides caprinus (Gunn. ) Papenf.. Ann Bot 20: 211-230.
Zinova, A.D. (1955). Opredelitel burykh vodoroslej severnykh morej SSSR [Determination book of the red algae of the northern seas of the USSR]. pp. 1-219 [+ 1], 169 figs. Moscow & Leningrad: Akad. Nauk SSSR.
Created: 30 March 1996 by M.D. Guiry
Verified by: 09 February 2017 by M.D. Guiry
Accesses: This record has been accessed by users 13775 times since it was created.
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Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 2019. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 15 September 2019.