153,631 species and infraspecific names are in the database, 20,983 images, 59,437 bibliographic items, 412,634 distributional records.

Eucheuma J.Agardh, 1847

Classification:
Empire Eukaryota
Kingdom Plantae
Subkingdom Biliphyta
Phylum Rhodophyta
Subphylum Eurhodophytina
Class Florideophyceae
Subclass Rhodymeniophycidae
Order Gigartinales
Family Solieriaceae

Lectotype species: Eucheuma spinosum J.Agardh

Currently accepted name for the type species: Eucheuma denticulatum (N.L.Burman) Collins & Hervey

Original publication:Agardh, J.G. (1847). Nya alger från Mexico. Öfversigt af Kongl. Vetenskaps-Adademiens Förhandlingar, Stockholm 4: 5-17.
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Type designated in Schmitz, F. (1889). Systematische Übersicht der bisher bekannten Gattungen der Florideen. Flora oder Allgemeine botanische Zeitung 72: 435-456, pl. XXI.
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Taxonomic status: currently recognized as a distinct genus.

Gender: This genus name is currently treated as neuter.

Most recent taxonomic treatment adopted: Huisman, J.M. (2018). Algae of Australia. Marine benthic algae of north-western Australia. 2. Red algae. pp. [i]-xii, 1-672, 189 figs. Canberra & Melbourne: ABRS & CSIRO Publishing.

Description: Thallus coarse, cartilaginous, rigid when fresh, attached by a discoid holdfast and (commonly) by numerous secondary holdfasts. Axes terete, compressed or flattened, often with many spinous branches. Structure with or without a rhizoidal inner medulla; if the latter then with a pseudoparenchymatous medulla, otherwise with a pseudoparenchymatous outer medulla of spherical to ellipsoidal cells and a cortex of rows of filaments composed of small elongate cells. Cell walls containing a predominance of ?-carrageenan. Spermatangia in clusters on the outer cortex. Cystocarps ostiolate, forming on lateral determinate branches, infrequently on main axes. Carposporophytes consisting of large central fusion cells with radiating gonimoblasts and sterile filaments that connect with cells of the surrounding pericarp. Tetrasporangia scattered in the outer cortical layer, zonately divided.

Information contributed by: J.M. Huisman (2018).. The most recent alteration to this page was made on 11 Oct 2018 by M.D. Guiry.

Numbers of names and species: There are 47 species names in the database at present, as well as 11 infraspecific names. Of the species names, 30 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.

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.

Created: 01 January 2001 by M.D. Guiry

Verified by: 11 October 2018 by M.D. Guiry

Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=35110

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 21 November 2018.

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