162,433 species and infraspecific names are in the database, 22,760 images, 64,011 bibliographic items, 474,997 distributional records.

Polysiphonia Greville, 1823, nom. et typ. cons.

Empire Eukaryota
Kingdom Plantae
Subkingdom Biliphyta
Phylum Rhodophyta
Subphylum Eurhodophytina
Class Florideophyceae
Subclass Rhodymeniophycidae
Order Ceramiales
Family Rhodomelaceae
Tribe Polysiphonieae

Holotype species: Polysiphonia urceolata (Lightfoot ex Dillwyn) Greville

Currently accepted name for the type species: Polysiphonia stricta (Mertens ex Dillwyn) Greville

Original publication and holotype designation: Greville, R.K. (1823). Scottish cryptogamic flora, or coloured figures and descriptions of cryptogamic plants, belonging chiefly to the order Fungi; and intended to serve as a continuation of English Botany. Vol. 2 (fasc. 13-18), pls 61-90. Edinburgh & London: MacLachlan & Stewart; Baldwin, Craddock & Joy.

Taxonomic status: currently recognized as a distinct genus.

Gender: This genus name is currently treated as feminine.

Nomenclatural notes
The name and the type have been conserved. - (26 Jan 2017) - M.D. Guiry

Taxonomic notes
Multigene phylogenetic analyses confirm that the genus Polysiphonia Greville is polyphyletic, and currently assigned species resolve with many other genera. Polysiphonia sensu stricto is restricted to a group of species that formed a monophyletic lineage with the type Polysiphonia stricta (Savoie & Saunders, 2019). - (13 Mar 2019) - Wendy Guiry

Description: Thallus tufted, erect or prostrate, with variously branched terete axes. Structure uniaxial with 4–many pericentral cells. Caduceous trichoblasts and branch primordia arising exogenously at the apices, generally 1 per segment in a spiral pattern (but not always present, and when present not always on all segments). Shed trichoblasts leaving a scar cell. Secondary cortication present in some species. Cystocarps lateral on polysiphonous branches, ovoid or spherical, ostiolate. Spermatangia in heads, on fertile trichoblasts or replacing them. Tetrasporangia tetrahedral, spherical, borne in linear series in polysiphonous branches.

Information contributed by: Huisman (2018). The most recent alteration to this page was made on 10 Oct 2018 by M.D. Guiry.

Numbers of names and species: There are 705 species names in the database at present, as well as 285 infraspecific names. Of the species names, 189 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.

Wynne, M.J. & Schneider, C.W. (2010). Addendum to the synoptic review of red algal genera. Botanica Marina 53: 291-299.

Savoie, A.M. & Saunders, G.W. (2018 '2019'). A molecular assessment of species diversity and generic boundaries in the red algal tribes Polysiphonieae and Streblocladieae (Rhodomelaceae, Rhodophyta) in Canada. European Journal of Phycology 54(1): 1-25.

Verification of data
Users are responsible for verifying the accuracy of information before use, as noted on the website Content page.

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: 26 January 2017 by M.D. Guiry

Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=37461

Citing AlgaeBase
Please cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 2021. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 30 July 2021.

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