Peyssonnelia dubyi P.Crouan & H.Crouan 1844

Peyssonnelia dubyi P.Crouan & H.Crouan

Peyssonnelia dubyi P.Crouan & H.CrouanRía de A Coruña, Galicia, Spain, 2016,Ignacio Bárbara (

Publication Details
Peyssonnelia dubyi P.Crouan & H.Crouan 1844: 368, pl. 11: figs 6-8 (as 'Peyssonelia')

Published in: Crouan, P.L. & Crouan, H.M. (1844). Observations sur le genre Peyssonelia Dne. Annales des Sciences Naturelles, Botanique, Troisième série 2: 367-368, pl. 11: figs 6-10.

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Type Species
The type species (lectotype) of the genus Peyssonnelia is Peyssonnelia squamaria (S.G.Gmelin) Decaisne ex J.Agardh.

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

Type Information
Type locality: Rade de Brest, Brittany, France.; (Athanasiadis 1996: 69) Type: CO; (Womersley 1994: 164) Notes: Dawson (1953: 112) Holotype not designated but represented by the original Crouan material in the Herbarium of the Museum of Paris. According to Womersley (1994: 164) the type material comes from Brivatem (Brest, France ). France (Banc de St. Marc, Brest) is cited in Irvine & Maggs 1983: 57). Isotypes: PC, AHFH (54107, slides 1573-4) also cited in Irvine & Maggs.

General Environment
This is a marine species.

Thin, dark-red crust, to 30 mm diam.; frequently with concentric surface markings. Relatively loosely attached to the substrate with a well-developed layer of lime on lower surface.

On calcareous encrusting algae and Laminaria hyperborea holdfasts, lower intertidal, widely distributed on western and southern coasts, not uncommon. Epilithic, epiphytic on encrusting corallines, Laminaria holdfasts and occasionally Gracilaria verrucosa etc, and on shells; in shallow pools in lower littoral, on pebbles in sheltered areas, sublittoral to 16 m tolerating a wide range of exposure to currents and wave action (Irvine & Maggs 1983: 59)

Key Characteristics
Loose attachment to the substratum, presence of concentric markings on the surface of the thallus.

Similar Species
Five species of Peyssonnelia are found in the British Isles and all require expert identification;P. dubyi seems to be the commonest and most widely distributed.

Created: 30 March 1996 by M.D. Guiry.

Last updated: 12 August 2021

Verification of Data
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Citing AlgaeBase
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 12 August 2021. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway.; searched on 11 August 2022

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