156,767 species and infraspecific names are in the database, 22,033 images, 60,595 bibliographic items, 449,807 distributional records.

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).

1  2  3  4  Next

33 Found - Displaying 1 through 10

 

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

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.
 Download PDF

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 (Click to Load)

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.

Verification of data
Users are responsible for verifying the accuracy of information before use, as noted on the website Content page.

Linking to this page: http://www.algaebase.org/search/species/detail/?species_id=32

Citing AlgaeBase
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 17 November 2019.

SITE © 1996 - 2019 M.D. Guiry. All rights reserved.

Website Design : 249 Design Studio