156,769 species and infraspecific names are in the database, 22,033 images, 60,598 bibliographic items, 449,807 distributional records.

Taonia J.Agardh, 1848

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

Holotype species: Taonia atomaria (Woodward) J.Agardh

Original publication and holotype designation: Agardh, J.G. (1848). Anadema, ett nytt slägte bland Algerne. Öfversigt af Kongl. Vetenskaps-Akademiens Förhandlingar, Stockholm 1846: 1-16, pl. XVII.

Taxonomic status: currently recognized as a distinct genus.

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: Thalli erect, attached by matted, branched rhizoids, up to 30 cm long, complanate, flabellate or lacerate with many elongate, cuneate branches, 0.5-6 cm broad, often tapering to the apex. Growth initiated from a marginal row of apical cells. Thallus 2 cells thick near apex increasing to 5-7 cells thick towards the thallus base, not arranged in rows in transverse section. Hairs in concentric lines across the thallus. Sporangia solitary, in irregularly scattered groups or in short concentric zones adjacent to the hair lines, partially embedded in or completely external to the frond, without a stalk cell or with 1-3 stalk cells, 80-140 mm high when mature, producing 4 spores. Gametophytes dioecious. Antheridial sori whitish, irregularly shaped, scattered over both thallus surfaces, 100-800 mm across, bounded by 1-2 layers of sterile cells. Antheridia with 15-20 tiers of locules, with one stalk cell. Oogonial plants unknown. Disjunct geographical distribution with one species in south-eastern Australia and New Zealand, one in California and one in Europe (Britain, Atlantic coast of France and Spain, Canary Islands and the Mediterranean Sea) and Morocco.

Information contributed by: J. A. Phillips and R. J. King. The most recent alteration to this page was made on 20 Jun 2014 by M.D. Guiry.

Numbers of names and species: There are 8 species names in the database at present, as well as 4 infraspecific names. Of the species names, 6 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: 28 December 2000 by M.D. Guiry

Verified by: 20 June 2014 by M.D. Guiry

Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=53

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 19 November 2019.

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