156,468 species and infraspecific names are in the database, 22,021 images, 60,453 bibliographic items, 447,756 distributional records.

Elachista Duby, 1830, nom. cons.

Classification:
Empire Eukaryota
Kingdom Chromista
Phylum Ochrophyta
Class Phaeophyceae
Subclass Fucophycidae
Order Ectocarpales
Family Chordariaceae

Holotype species: Elachista scutellata Duby

Currently accepted name for the type species: Elachista scutulata (Smith) Areschoug

Original publication and holotype designation: Duby, J.É. (1830). Aug. Pyrami de Candolle Botanicon gallicum sen synopsis plantarum in flora gallica descriptarum. Editio secunda. Ex herbariis et schedis Candollianis propriisque digestum a J. É. Duby V.D.M. Pars secunda plantas cellulares continens. pp. [i-vi], [545]-1068, [i]-lviii. Paris: Ve Desray, Rue Hautefueille, No. 4.
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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
Duby used the epithet "scutellata" instead of "scutulata" (INA). It is difficult know know if this was an unwarranted change of epithet, and thus illegitimate, or an orthographic error, in which cased it should be correctable. For the present, in view of the entry in Index Nominum Genericorum, it is treated here as an illegitimate name. - (29 Aug 2011) - M.D. Guiry

Description: Thallus epiphytic, forming tufts to 20 mm high on surface of host. Basal layer adpressed to host. Erect branched filaments issuing from the basal layer, consisting of unpigmented proximal portion of more or less inflated cells forming the medulla and pigmented distal part of barrel-shaped cells with intercalary meristem (= assimilatory filament) forming the cortex of the thallus. Longer, straight and shorter, often curved assimilatory filaments may both occur in same thallus. Reproductive organs simple uniseriate plurilocular and/or obovate unilocular sporangia, produced within the cortex from outermost medulla cells or inserted laterally on stalk cells at the base, in some cases also in distal parts, of assimilatory filaments. Phaeophycean hairs absent. Life history direct without ploidy change from zoids from plurilocular sporangia, or direct with meiosis in unilocular sporangia and somatic diploidization in basal cells of erect filaments. Haploid chromosome number about 10.

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 warm and cold temperate seas.

Numbers of names and species: There are 57 species names in the database at present, as well as 11 infraspecific names. Of the species names, 24 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: 29 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=42

Citing AlgaeBase
Please cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 2019. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 14 October 2019.

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