Coelarthrum Børgesen, 1910

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 publication: 1 December 1910

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 2017-01-24 by M.D. Guiry.

Taxonomic status: This name is of an entity that is currently accepted taxonomically.

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: .

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.).

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Contributors
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.

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

Citing AlgaeBase
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 24 January 2017. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 22 November 2024