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Rhodothamniella floridula (Dillwyn) Feldmann 1978

Empire Eukaryota
Kingdom Plantae
Subkingdom Biliphyta
Phylum Rhodophyta
Subphylum Eurhodophytina
Class Florideophyceae
Subclass Nemaliophycidae
Order Palmariales
Family Rhodothamniellaceae
Genus Rhodothamniella


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Sargassum henslowianum C.Agardh

Rhodothamniella floridula (Dillwyn) Feldmann South of Portugal, 2010
© Ignacio Bárbara (barbara@udc.es)

Publication details
Rhodothamniella floridula (Dillwyn) Feldmann in T.Christensen 1978: 67

Published in: Christensen, T. (1978). Annotations to a textbook of phycology. Botanisk Tidsskrift 73: 65-70.

Type species
This is the type species (holotype) of the genus Rhodothamniella.

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

Conferva floridula Dillwyn

Type information
Syntype localities: "Rocks on the Sea shore. On the Galway Coast; Dr. Scott. On the Antrim Coast; Mr. Mackay." [Ireland] (Dillwyn 1809: 73). Lectotype: BM (Woelkerling & Womersley 1994: 45). Notes: Type locality: Galway coast, Ireland; Holotype (cited as lectotype in Diaz-Tapia, 2014): NMW (fide Woelkerling, 1971: 31). "Dr Scott" was probably Robert Scott (ca 1757-1808), Professor of Botany at Trinity College Dublin from 1800 to 1808. Mr MacKay was James Townsend MacKay (ca 1775-1862), first curator of the [Trinity] College Botanic Gardens, then at Ballsbridge, Dublin, from 1808, and an Assistant at TCD from 1806. [Woelkerling 1971: 31 cites NMW but later publications cite BM (Dixon & Irvine, 1977: 97; Woelkerling & Womersley in Womersley, 1994: 45)].

Origin of species name
(Latin), a diminutive of floridus meaning, somewhat blooming.

Homotypic Synonym(s)
Conferva floridula Dillwyn 1809
Ceramium floridulum (Dillwyn) C.Agardh 1817
Callithamnion floridulum (Dillwyn) Lyngbye 1819
Trentepohlia floridula (Dillwyn) Harvey 1836
Rhodochorton floridulum (Dillwyn) Nägeli 1862
Thamnidium floridulum (Dillwyn) Thuret 1863
Chromastrum floridulum (Dillwyn) Papenfuss 1945
Kylinia floridula (Dillwyn) Papenfuss 1947
Audouinella floridula (Dillwyn) Woelkerling 1971

Habitat notes
Sand-covered rocks; from the upper intertidal to the upper subtidal, in sites from shelterd to extremely wave-exposed ( Diaz-Tapia & Bárbara, 2014) - (24 Jun 2014) - Wendy Guiry

General environment
This is a marine species.

Common names

(as Rhodothamniella floridula (Dillwyn) Feldmann)
English: Sand Binder (Bunker & al. 2010).

Forming a dense, brown- or purplish-red turf of sparingly branched erect, uniseriate hair-like filaments. Cells oblong, 3-4 times as long as broad. Several plastids, each with a pyrenoid, against cell wall. Reproducing by tetrasporangia, mostly in winter. Monosporangia absent.

Turf-forming on sand-covered rocks, mid- and lower intertidal, often under Fucus serratus; widely distributed, very common.

Key characteristics
Turf-forming habit and association with sand-coved rocks. Absence of monosporangia.

Similar species
Rhodochorton purpureum forms less extensive turfs. Microscopic examination (for the presence of pyrenoids in plastids) is required to be certain of the identity of this species.

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.

Boraso de Zaixso, A.L. (2013). Elementos para el estudio de las macroalgas de Argentina. Con colaboración de J.M. Zaixso. pp. [1]-204. Comodoro Rivadavia: Universitaria de la Patagonia.

Diaz-Tapia, P. & Bárbara, I. (2014). Seaweeds from sand-covered rocks of the Atlantic Iberian Peninsula. Part 2. Palmariales, Ceramiales (excluding Rhodomelaceae), Gelidiales, Gigartinales, Plocamiales, Rhodymeniales and Scytothamniales. Cryptogamie Algologie 35(2): 157-199.

Funk, G. (1955). Beiträge zur Kenntnis der Meeresalgen von Neapel: Zugleich mikrophotographischer Atlas. Pubblicazioni della Stazione Zoologica di Napoli 25(Suppl.): i-x , 1-178, 36 figs.

Garbary, D.J. (1987). The Acrochaetiaceae (Rhodophyta): an annotated bibliography. Bibliotheca Phycologica 77: 1-267, 2 tables.

Silva, P.C., Basson, P.W. & Moe, R.L. (1996). Catalogue of the benthic marine algae of the Indian Ocean. University of California Publications in Botany 79: [i]-xiv, 1-1259.

Stegenga, H. (1978). Life histories of Rhodochorton purpureum and Rhodochorton floridulum (Rhodophyta, Nemaliales) in culture. British Phycological Journal 13: 279-289.

Woelkerling, W.J. & Womersley, H.B.S. (1994). Order Acrochaetiales Feldmann 1953: 12. In: The marine benthic flora of southern Australia. Rhodophyta - Part IIIA. (Womersley, H.B.S. Eds), pp. 42-76. Canberra:

Created: 30 March 1996 by M.D. Guiry

Verified by: 01 February 2017 by M.D. Guiry

Accesses: This record has been accessed by users 19058 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.

(Please note: only references with the binomials in the title are included. The information is from the Literature database.)

Hommeril, P. & Rioult, M. (1962). Phenomenes d'erosion et de sedimentation marines entre Sainte-Honorine-des-Pertes et Port-en-Bessin (Calvados). Role de Rhodothamniella floridula dans la retenue des sediments fins. Cah. Oceanogr. 14: 25-45.
Hommeril, P. & Rioult, M. (1965). Étude de la fixation de sédiments meubles par deux algues marines: Rhodothamniella floridula (Dillwyn) J. Feldmn. et Microcoleus chtonoplastes Thur.. Mar. Geol. 3: 131-155.
Lichtlé, C. (1973). Ultrastructure du plaste de deux Rhodophycées: Rhodochorton purpureum (Lighft.) Rosenvinge et Rhodothamniella floridula (Dillwyn) J. Feldmann. Compte Rendu Hebdomadaire des Séances de l’Académie des Sciences. Paris. Série D 277: 1865-1868.
Pérez-Ruzafa, I., Lazzo, G. & Conde Poyales, F. (2005). Mapas de distribución de algas marinas de la Península Ibérica e Islas Baleares. XIX. Palmaria palmata y Rhodothamniella floridula (Palmariales, Rhodophyta). Botanica Complutensis 29: 71-75.

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M.D. Guiry in Guiry, M.D. & Guiry, G.M. 2021. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 23 October 2021.

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