Polyides rotunda (Hudson) Gaillon 1828

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, édition 2 [F. Cuvier] 53: 350-406, 3 tables.

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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: "prope S. Ives" [St Ives, Cornwall, England]; (Hudson 1762: 471) Lectotype (designated by ? 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 1983).

General Environment
This is a marine species.

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.

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

Citing AlgaeBase
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 22 November 2024

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