Polyides rotunda (Hudson) Gaillon 1828
Polyides rotunda (Hudson) GaillonSpain, Galicia, A Coruña, Muxía, 2009, TS with tetrasporangiaIgnacio Bárbara (email@example.com)
Polyides rotunda (Hudson) Gaillon 1828: 365 (as 'Rotunda')
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).
This is a marine species.
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.
Created: 30 March 1996 by M.D. Guiry.
Last updated: 17 February 2020
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Linking to this page: https://www.algaebase.org/search/species/detail/?species_id=32
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 17 February 2020. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 29 November 2022