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Coelothrix Børgesen, 1920

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

Holotype species: Coelothrix irregularis (Harvey) Børgesen

Original publication and holotype designation: Børgesen, F. (1920). The marine algae of the Danish West Indies. Part 3. Rhodophyceae (6). Dansk Botanisk Arkiv 3: 369-504, Figs 361-435.
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Taxonomic status: currently recognized as a distinct genus.

Most recent taxonomic treatment adopted: Schneider, C.W. & Wynne, M.J. (2007). A synoptic review of the classification of red algal genera a half a century after Kylin's "Die Gattungen der Rhodophyceen". Botanica Marina 50: 197-249.

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

Taxonomic notes
Le Gall et al. (2008) provided evidence for the transfer of Coelothrix from the Rhodymeniaceae to the Champiaceae. - (5 Jul 2011) - Wendy Guiry

Description: Plants forming firm cushions; fronds erect, terete or slightly compressed, irregularly branched with branches anastomosing frequently; cortex of 5-6 layers of large cells covered by a complete layer of small cells; medullary cavity small, septa absent, containing a few longitudinal filaments bearing inwardly-directed secretory cells and filled with a watery mucilage.

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

Comments: The cystocarp of C. irregularis has been found on only one occasion (Collins 1901, as Cordylecladia irregularis), but full details were not given. Ginsberg-Ardré & Palmahina (1964, pl. 1, fig. 4; pl. 2, fig. 2) have described the spermatangia of C. irregularis, and they resemble the spermatangia of Lomentaria clavellosa (cf. Kylin 1928, fig. 33) and other members of the Champiaceae and Lomentariaceae. Further knowledge of the cystocarp is necessary before this genus can be clearly distinguished from Lomentaria (q.v.). Taylor (1960) stated that the tetrasporangia of his material of the type species were “...aggregated in slightly swollen branch tips.”, but he did not state whether or not the tetrasporangia are borne in pits in a manner similar to that found in species of Lomentaria.

Coelothrix irregularis is widespread in the Caribbean (Taylor 1960) and the Indian and Pacific Oceans (Ginsberg-Ardré & Palmahina 1964, p. 329), and occurs in Portugal (Ginsberg-Ardré & Palmahina 1964; Ardré 1970).

Numbers of names and species: There are 2 species names in the database at present, of which 2 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.

Wynne, M.J. & Schneider, C.W. (2010). Addendum to the synoptic review of red algal genera. Botanica Marina 53: 291-299.

Le Gall, L., Dalen, J.L. & Saunders, G.W. (2008). Phylogenetic analyses of the red algal order Rhodymeniales supports recognition of the Hymenocladiaceae fam. nov., Fryeellaceae fam. nov., and Neogastroclonium gen. nov. Journal of Phycology 44: 1556-1571.

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=Z7115a03b19950a4d

Citing AlgaeBase
Please cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 2018. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 20 July 2018.

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