153,593 species and infraspecific names are in the database, 20,980 images, 59,399 bibliographic items, 411,125 distributional records.

Desmarestia J.V.Lamouroux, 1813, nom. cons.

Classification:
Empire Eukaryota
Kingdom Chromista
Phylum Ochrophyta
Class Phaeophyceae
Subclass Fucophycidae
Order Desmarestiales
Family Desmarestiaceae

Holotype species: Desmarestia aculeata (Linnaeus) J.V.Lamouroux

Original publication and holotype designation: Lamouroux, J.V.F. (1813). Essai sur les genres de la famille des thalassiophytes non articulées. Annales du Muséum d'Histoire Naturelle, Paris 20: 21-47, 115-139, 267-293, pls 7-13.
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Taxonomic status: currently recognized as a distinct genus.

Gender: This genus name is currently treated as feminine.

Most recent taxonomic treatment adopted: Silberfeld, T., Rousseau, F. & Reviers, B. de (2014). An updated classification of brown algae (Ochrophyta, Phaeophyceae). Cryptogamie Algologie 35(2): 117-156.

Nomenclatural notes
Named by Lamouroux for "mon ami A. G. Desmarest". - (23 Jan 2011) - M.D. Guiry

Description: Thallus erect, terete, compressed or ligulate, simple or branched, may be several m high, annual or perennial, usually epilithic. Vacuolar sap of the annual species contains sulfuric acid, pH may be as low as 1. Main axial filament with subterminal intercalary growth.and terminated by a feathery end filament eventually lost in mature thalli. Axial filament surrounded by a thick medulla of unpigmented cells formed by downwardgrowing hyphae. Cortex a dense layer of small isodiametric cells containing several lenticulate plastids without pyrenoids. Phaeophycean hairs absent. Unilocular sporangia either subglobular, produced by transformation of surface cells, or ovoid-elongate, formed on stalk cells in elevated sori together with one to 2-celled parapyses. Life history heteromorphic with macroscopic sporophyte and microscopic filamentous branched monoecious or dioecious gametophytes. When dioecious gametophytes are sexually dimorphic, male filaments to 10 µm and female to 30 µm in diameter. Male gametes are motile spermatozoids formed in clusters of club-shaped antheridia. Female gametes are oocytes formed in elongate oogonia. Release of spermatozoids from antheridia and subsequent attraction towards eggs mediated by desmarestene, a sexual pheromone segregated by mature oocytes. Chromosome numbers are n=22-23; 2n=44-46, but higher counts (2n=52-56) have been reported.

Information contributed by: A. F. Peters. The most recent alteration to this page was made on 19 Oct 2015 by M.D. Guiry.

Comments: Widely distributed in polar to warm-temperate seas. Dominant and stand-forming in Antarctica and some parts of the Arctic.

Common names

(as Desmarestia)
English: Sea sorrel (Dickinson 1963).

French: Oseille de mer (Dickinson 1963).

Numbers of names and species: There are 43 species names in the database at present, as well as 30 infraspecific names. Of the species names, 25 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.

References
Womersley, H.B.S. (1987). The marine benthic flora of southern Australia. Part II. pp. 481, 169 figs, 1 table, 8 plates, 4 maps. Adelaide: South Australian Government Printing Division.

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: 28 December 2000 by M.D. Guiry

Verified by: 19 October 2015 by M.D. Guiry

Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=56

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 16 November 2018.

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