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Polyides rotunda (Hudson) Gaillon

Classification:
Empire Eukaryota
Kingdom Plantae
Subkingdom Biliphyta
Phylum Rhodophyta
Subphylum Eurhodophytina
Class Florideophyceae
Subclass Rhodymeniophycidae
Order Gigartinales
Family Polyidaceae
Genus Polyides

Pictures

click on thumbnail for larger version.

Polyides rotunda (Hudson) Gaillon
habit with cystocarps, Costa da Morte, Galicia, Spain, 2009. Ignacio Bárbara. © Ignacio Bárbara (barbara@udc.es).

Polyides rotunda (Hudson) Gaillon
microscope tetrasporangia, Brittany, France, 2008. Ignacio Bárbara. © Ignacio Bárbara (barbara@udc.es).

Polyides rotunda (Hudson) Gaillon
microscope, transverse seccion with tetrasporangia, Brittany, France, 2008. Ignacio Bárbara. © Ignacio Bárbara (barbara@udc.es).

Polyides rotunda (Hudson) Gaillon
microscope, longitudinal seccion, Brittany, France, 2008. Ignacio Bárbara. © Ignacio Bárbara (barbara@udc.es).

Polyides rotunda (Hudson) Gaillon
microscope transverse seccion with cystocarps, Costa da Morte, Galicia, Spain, 2009. Ignacio Bárbara. © Ignacio Bárbara (barbara@udc.es).

Polyides rotunda (Hudson) Gaillon
microscope transverse seccion, Costa da Morte, Galicia, Spain, 2009. 01 Jan 0001. Ignacio Bárbara. © Ignacio Bárbara (barbara@udc.es).

Polyides rotunda (Hudson) Gaillon
microscope longitudinal seccion, Costa da Morte, Galicia, Spain, 2009. Ignacio Bárbara. © Ignacio Bárbara (barbara@udc.es).

Polyides rotunda (Hudson) Gaillon
habit, Costa da Morte, Galicia, Spain, 2009. Ignacio Bárbara. © Ignacio Bárbara (barbara@udc.es).

Polyides rotunda (Hudson) Gaillon
Spiddal, Co. Galway, Ireland; discoid base . 29 Mar 2012. M.D. Guiry. © M.D. Guiry (mikeguiry@me.com).

Polyides rotunda (Hudson) Gaillon
Spiddal, Co. Galway, Ireland; note tiny disc at base. 29 Mar 2012. M.D. Guiry. © M.D. Guiry (mikeguiry@me.com).

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33 Found - Displaying 1 through 10

 

Streblocladia neglecta F.Schmitz

Polyides rotunda (Hudson) Gaillon Finavarra, Co. Clare, Ireland
© M.D. Guiry (mike.guiry@nuigalway.ie)

Publication details
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.
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Type species
The type species (holotype) of the genus Polyides is Polyides lumbricalis C.Agardh.

Status of name
This name is of an entity that is currently accepted taxonomically.

Basionym
Fucus rotundus Hudson

Type information
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).

Homotypic Synonym(s)
Fucus rotundus Hudson 1762
Chordaria rotunda (Hudson) C.Agardh 1817
Furcellaria rotunda (Hudson) Lyngbye 1819
Bifurcaria rotunda (Hudson) Papenfuss 1950

Heterotypic Synonym(s)
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

General environment
This is a marine species.

Common names

(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).

Description
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.

Habitat
On rocks and stones in open sandy pools and runnels, lower intertidal and shallow subtidal, widely disrtibuted, common.

Similar species
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.

Detailed distribution with sources
(as Polyides rotunda (Hudson) Gaillon)
Arctic: White Sea (Smirnova & Mikhailova 2013, Garbary & Tarakhovskaya 2013, Mikhaylova 2017).

Europe: Atlantic France (Burel, Le Duff & Ar Gall 2019), Baltic Sea (Nielsen et al. 1995, Kontula & Fürhapter 2012), Britain (Newton 1931, Dixon & Irvine 1977, Hardy & Guiry 2003, Brodie et al. 2016, Bunker et al. 2017), Channel Islands (Lyle 1920, Dixon 1961), Faroe Islands (Irvine 1982, Nielsen & Gunnarsson 2001), France (Coppejans & Kling 1995, Dizerbo & Herpe 2007, Anon. 2017), France (Breizh) (Loiseaux-de Goër & Noailles 2008), Germany (Ludwig & Schnittler 1996), Helgoland (Bartsch & Kuhlenkamp 2000), Ireland (Adams 1908, Cotton 1912, Cullinane 1971, Guiry 1978, De Valéra et al. 1979, Maggs 1983, Whelan & Cullinane 1985, Morton 1994, Guiry 2012, Bunker et al. 2017), Italy (Giaccone 1969), Netherlands (Stegenga & Mol 1983, Stegenga et al. 1997), Norway (Rueness 1997, Brattegard & Holte 2001), Scandinavia (Athanasiadis 1996), Spain (Miranda 1931, Conde Poyales & Seoane Camba 1982, Fernández, Niell & Anadón 1983, Gallardo et al. 1985, Conde et al. 1996, Bárbara et al. 2012), Spain (incl. Canary Is.) (Gallardo et al. 2016), Sweden (Kylin 1907, Kylin 1944, Tolstoy & Österlund 2003).

North America: Connecticut (CT) (Schneider, Suyemoto & Yarish 1979), Maine (ME) (Mathieson et al. 2001), New Brunswick (Bates et al. 2005), New Hampshire (HN) (Mathieson & Hehre 1986, Mathieson & Dawes 2002), Nova Scotia (Tai, Lindstrom & Saunders 2001, Pueschel & Saunders 2009).

Asia: Russia (Far East) (Perestenko 1980).

(as Bifurcaria rotunda (Hudson) Papenfuss)
Europe: France (Anon. 2017), France (Breizh) (Feldmann 1954).

Africa: Morocco (Dangeard 1949).

(as Polyides caprina (Gunnerus) Papenfuss)
Arctic: Canada (Arctic) (Taylor 1957).

Europe: France (Breizh) (Feldmann 1954).

Key references
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. [1]-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, [1]-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, [1]-218, pl. 1-19. Edinburgh & London: McLachlan & Stewart; Baldwin & Cradock.

Loiseaux-de Goër, S. & Noailles, M.-C. (2008). Algues de Roscoff. pp. [1]-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 19 September 2019.

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