157,585 species and infraspecific names are in the database, 22,210 images, 61,003 bibliographic items, 459,457 distributional records.

Rhizoclonium Kützing, 1843

Empire Eukaryota
Kingdom Plantae
Subkingdom Viridiplantae
Infrakingdom Chlorophyta infrakingdom
Phylum Chlorophyta
Subphylum Chlorophytina
Class Ulvophyceae
Order Cladophorales
Family Cladophoraceae

Lectotype species: Rhizoclonium juergensii (Mertens) Kützing

Currently accepted name for the type species: Rhizoclonium tortuosum (Dillwyn) Kützing

Original publication:Kützing, F.T. (1843). Phycologia generalis oder Anatomie, Physiologie und Systemkunde der Tange. Mit 80 farbig gedruckten Tafeln, gezeichnet und gravirt vom Verfasser. pp. [part 1]: [i]-xxxii, [1]-142, [part 2:] 143-458, 1, err.], pls 1-80. Leipzig: F.A. Brockhaus.
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Type designated in Koster, J.T. (1955). The genus Rhizoclonium Kütz. in the Netherlands. Pubblicazioni della Stazione Zoologica di Napoli 27: 335-357, 5 figs.

Taxonomic status: currently recognized as a distinct genus.

Most recent taxonomic treatment adopted: Brodie, J., Maggs, C.A. & John, D.M. (2007). Green seaweeds of Britain and Ireland. pp. [i-v], vi-xii, 1-242, 101 figs. London: British Phycological Society.

Description: Filaments slender, 60 um in diamter, loose lying with basal cells, or attached by holdfast with basal lobes. Plants unbranched or with one- to few-celled rhizoidal laterals. Cells several to many times longer than broad. Nuclei numerous. Chloroplast reticulate, parietal, with pyrenoids, often densely packed with starch. Reproduction in freshwater species by fragmentation and, more rarely biflagellate zoospores. In marine/brackish species, isomorphic life history with quadriflagellate zoospores and biflagellate gametes reported from 2 species.

Information contributed by: T.J. Entwisle. The most recent alteration to this page was made on 29 Aug 2011 by M.D. Guiry.

Comments: Rhizoclonium cosmopolitan in fresh, brackish and marine waters, often growing entagled with other algae, or in salt marshes forming a dense mat. Sexual reproduction of R. riparium rare under estuaring conditions, biflagellate zoospores more commonly produced in populations growing on hard rather than soft substrata. Cytological studies indicate a wide range of chromosomes from n=10 to n=30, counts varying between different populations of the same species. Rhizoclonium is not always clearly delimited from Chaetomorpha.

Common names

(as Rhizoclonium)
Swedish: Grönkrull (Tolstoy & Österlund 2003).

Numbers of names and species: There are 65 species names in the database at present, as well as 30 infraspecific names. Of the species names, 32 have been flagged as accepted taxonomically on the basis of the listed literature under the species name. In some instances, opinions on taxonomic validity differ from author to author and users are encouraged to form their own opinion. AlgaeBase is a work in progress and should not be regarded as a definitive source only as a guide to the literature..

Names: ('C' indicates a name that is accepted taxonomically; 'S' a homotypic or heterotypic synonym; 'U' indicates a name of uncertain taxonomic status, but which has been subjected to some verification nomenclaturally; 'P' indicates a preliminary AlgaeBase entry that has not been subjected to any kind of verification. For more information on a species click on it to activate a link to the Species database):

Click here to also show infraspecific names in the list below.

John, D.M. (2002). Order Cladophorales (=Siphonocladales). In: The Freshwater Algal Flora of the British Isles. An identification guide to freshwater and terrestrial algae. (John, D.M., Whitton, B.A. & Brook, A.J. Eds), pp. 468-470. Cambridge: Cambridge University Press.

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

Some of the descriptions included in AlgaeBase were originally from the unpublished Encyclopedia of Algal Genera, organised in the 1990s by Dr Bruce Parker on behalf of the Phycological Society of America (PSA) and intended to be published in CD format. These AlgaeBase descriptions are now being continually updated, and each current contributor is identified above. The PSA and AlgaeBase warmly acknowledge the generosity of all past and present contributors and particularly the work of Dr Parker.

Descriptions of chrysophyte genera were subsequently published in J. Kristiansen & H.R. Preisig (eds.). 2001. Encyclopedia of Chrysophyte Genera. Bibliotheca Phycologica 110: 1-260.

Created: 28 December 2000 by M.D. Guiry

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Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=32845

Citing AlgaeBase
Please cite this record as:
Guiry, M.D. & Guiry, G.M. 2020. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 28 February 2020.

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