Ralfsia disciformis P.Crouan & H.Crouan 1867

Publication Details
Ralfsia disciformis P.Crouan & H.Crouan 1867: 166

Published in: Crouan, P.L. & Crouan, H.M. (1867). Florule du Finistère contenant les descriptions de 360 espèces nouvelles de sporogames, de nombreuses observations et une synonymic des plantes cellulaires et vasculaires qui croissent spontanément dans ce département, accompagnées de trente-deux planches où est représentée l'organographie, faite sur l'état vif, des fruits et des tissus de 198 genres d'algues avec la plante grandeur naturelle ou réduite plus une planche supplémentaire où sont figures 24 champignons nouveaux. pp. [i]-x, [1]-262, frontisp., pi. 1-31, + 1 suppl. pl., coloured liths. by H. Crouan. Paris & Brest: Friedrich Klincksieck & J.B. et A. Lefournier.

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Type Species
The type species (holotype) of the genus Ralfsia is Ralfsia deusta (C.Agardh) Berkeley.

Status of Name
This name is currently regarded as a synonym of Stragularia disciformis (P.Crouan & H.Crouan) R.L.Fletcher.

Source of Synonymy
Fletcher, R.L. (2024). Brown seaweeds (Phaeophyceae) of Britain and Ireland. pp. [i]-x, [1]–806. London: Pelagic Publishing & Natural History Museum.

General Environment
This is a marine species.

Created: 02 September 1996 by M.D. Guiry.

Last updated: 17 October 2024

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

Taxonomic note
"This species was described by P. Crouan & H. Crouan (1867) from material dredged at Brest. The description was inadequate and, as Batters (1896) pointed out, comes very near to that of Ralfsia clavata (= Stragularia clavata in the present text), from which it differs by the shorter, 1%u20132-celled, less clavate paraphyses which are hardly any longer than the unilocular sporangia. The record for Britain is based on material dredged from deep water near the mouth of the River Yealm, Plymouth Sound, south coast of England (Batters 1896). Examination of material deposited in the BM reveal 2%u20134-celled paraphyses and unilocular sporangia with size ranges within those given for Stragularia clavata in the present work. Stragularia disciformis is, therefore, excluded from the flora of Britain." (Fletcher 2024: 520). - (11 May 2006) - G.M. Guiry

Distributional note
According to Fletcher (1987) this species is absent from the shores of Britain and Ireland. - (11 May 2006) - G.M. Guiry

Linking to this page: https://www.algaebase.org/search/species/detail/?species_id=997

Citing AlgaeBase
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 17 October 2024. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 15 June 2025

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