158,859 species and infraspecific names are in the database, 22,385 images, 61,541 bibliographic items, 456,697 distributional records.

Coelarthrum Børgesen, 1910

Empire Eukaryota
Kingdom Plantae
Subkingdom Biliphyta
Phylum Rhodophyta
Subphylum Eurhodophytina
Class Florideophyceae
Subclass Rhodymeniophycidae
Order Rhodymeniales
Family Rhodymeniaceae

Holotype species: Coelarthrum albertisii (Piccone) Børgesen

Original publication and holotype designation: Børgesen, F. (1910). Some new or little known West Indian Florideae. II. Botanisk Tidsskrift 30: 177-207, 20 figs.

Precise date of publication1 December 1910

Taxonomic status: currently recognized as a distinct genus.

Most recent taxonomic treatment adopted: Gil-Rodríguez, M.C. & Haroun, R. (2002). Vegetative and reproductive phenology of Chondrophycus perforatus and Laurencia viridis (Rhodomelaceae, Rhodophyta) in Tenerife, Canary Islands. Constancea 83.20: .

Nomenclatural notes
Monotypic when first introduced. - (24 Jan 2017) - M.D. Guiry

Description: Thallus erect or decumbent, with hollow, tubular, regularly constricted, articulated, dichotomously to radially branched fronds. Construction multiaxial, outer cortex of one to several layers of small pigmented cells. Medulla consisting of cavities filled with a weak mucilage, lined with a single layer of large colourless cells on which secretory cells borne on stellate cells are formed, rhizoids or longitudinal filaments absent (except C. cliftonii), diaphragms at the constrictions consisting of 1-2 layers of large colourless cells. Spermatangia borne on outer cortical cells. Carpogonial branches 4-celled borne on an inner cortical cell bearing a 2-celled auxiliary cell branch; gonimoblast developing outwards. Cystocarps ostiolate, scattered, never coronate, strongly protruding outwards or partially sunken, most cells forming carposporangia, tela arachnoidea absent. Tetrasporangia formed in an intercalary position from cortical filaments, scattered. Spores regularly cruciately arranged, occasionally approaching tetrahedral. No information is available on the growth in culture or life history of species of Coelarthrum. It is likely, however, that all have a 'Polysiphonia-type' life history.

Information contributed by: M.D. Guiry. The most recent alteration to this page was made on 24 Jan 2017 by M.D. Guiry.

Comments: Coelarthrum albertisii is widely distributed in tropical and subtropical seas where it occurs on exposed coral reefs and to a depth of 27 m. C. cliftonii(Harvey) Kylin (including C. mortensenii Børgesen; Huisman 1996) is known from the Indian Ocean, Western and South Australia, the Caribbean and the Canary Islands. C. decumbens Huisman was described from Lord Howe Island, New South Wales and Queensland, Australia. C. opuntia (Endlichter) Børgesen (including C. muelleri (Sonder) Børgesen) is widely distributed in the Indian Ocean, western and southern Australia. Two species Coelarthrum boergesenii and C. lomentariae formerly referred to this genus have been referred to Chamaebotrys Huisman (q.v.).

Numbers of names and species: There are 9 species names in the database at present, as well as 1 infraspecific names. Of the species names, 3 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.

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: 01 January 2001 by M.D. Guiry

Verified by: 24 January 2017 by M.D. Guiry

Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=35197

Citing AlgaeBase
Please cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 2020. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 08 August 2020.

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