153,622 species and infraspecific names are in the database, 20,981 images, 59,421 bibliographic items, 412,629 distributional records.

Dictyota J.V.Lamouroux, 1809, nom. et typ. cons.

Classification:
Empire Eukaryota
Kingdom Chromista
Phylum Ochrophyta
Class Phaeophyceae
Subclass Dictyotophycidae
Order Dictyotales
Family Dictyotaceae
Tribe Dictyoteae

Holotype species: Dictyota dichotoma (Hudson) J.V.Lamouroux

Original publication and holotype designation: Lamouroux, J.V.F. (1809). Exposition des charactères du genre Dictyota, et tableu des espèces qu'il referme. Journal de Botanique (Desvaux) 2: 38-44.
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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.

Description: Thallus flattened, ribbon-like, erect or prostrate, with smooth, dentate, crenulate or ciliate margins; attachment by basal rhizoids or marginal rhizoidal processes scattered along the edges of the thallus or restricted to the base, stoloniferous holdfasts present or absent; branching dichotomous, anisotomous or alternate, rarely falcate; apices obtuse, rounded, apiculate or acute; phaeophycean hairs and superficial proliferations present or absent; thallus differentiated into a cortex and a medulla, the relative number of layers variable. Sporangia isolated, grouped in sori or surrounding a central hair tuft, lacking a conspicuous involucrum of sterile cells, subtended by a single stalk cell. Antheridia subtended by a single stalk cell, arranged in sori, surrounded by hyaline, unicellular paraphyses. Oogonia subtended by a stalk cell, arranged in sori.

The most recent alteration to this page was made on 19 Oct 2015 by M.D. Guiry.

Comments: Cosmopolitan distribution.

Common names

(as Dictyota)
Portugese: uma alga parda (Oliveira 1951).

Numbers of names and species: There are 221 species names in the database at present, as well as 90 infraspecific names. Of the species names, 97 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
Ribero Siguan, M.A., Gomez Garreta, A., Salvador Soler, N. Rull Lluch, J. & Kapraun, D.F. (2011). Nuclear content estimates suggest a synapomorphy between Dictyota and six genera of the Dictyotales (Phaeophyceae). Cryptogamie Algologie 32(2): 205-219.

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=51

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 November 2018.

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