163,924 species and infraspecific names are in the database, 22,783 images, 63,106 bibliographic items, 484,278 distributional records.

Polyostea Ruprecht, 1850

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

Lectotype species: Polysiphonia urceolata (Lightfoot ex Dillwyn) Greville

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

Original publication:Ruprecht, F.J. (1850). Algae ochotenses. Die ersten sicheren Nachrichten über die Tange des Ochotskischen Meeres. pp. 1-243, 10 pls. St. Petersburg: Buchdruckerei der Kaiserlichen Akademie der Wissenschaften.
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Type designated in Savoie, A.M. & Saunders, G.W. (2016). A molecular phylogenetic and DNA barcode assessment of the tribe Pterosiphonieae (Ceramiales, Rhodophyta) emphasizing the Northeast Pacific. Botany 94: 917-939, 8 figs.

Taxonomic status: currently regarded as a synonym of Polysiphonia.

Gender: This genus name is currently treated as feminine.

Most recent taxonomic treatment adopted: Wynne, M.J. (2018). The status of Polyostea Ruprecht (1850) and the proposal of Savoiea gen. nov. (Rhodomelaceae, Rhodophyta). Notulae Algarum 69: 1-4.

Nomenclatural notes
See Wynne (2018) for a discussion of the type. Polyostea Ruprecht was a replacement name for Polysiphonia, thus the two names are homotypic synonyms. See Silva (1952). - (28 Jul 2018) - M.D. Guiry

Description: Thalli polysiphonous with 4–14 pericentral cells, ecorticate, lacking trichoblasts; both prostrate and erect axes cylindrical, erect axes arising from a prostrate basal system; prostrate axes attached to the substrate by unicellular rhizoids, rhizoids cut off from pericentral cells; erect axes 150–350 m in diameter, with generally alternate-distichous branching (especially in upper parts), despite radial development of laterals at the apices; branching to several orders, with laterals arising at regular intervals of two or three successive segments, proximal segments of laterals fused with the bearing axis over 0.5–1.5 segments, terminal ramuli often incurved and overtopping the apices (giving the appearance of sympodial growth). Tetrasporangia tetrahedral, with two cover cells, occurring one per segment in straight series in ultimate and subultimate branches. Cystocarps are globular to ovoid, on short pedicels. Spermatangia known only from P. robusta, spermatangial branches cylindrical, on short branchlets on ultimate laterals, with 3–4 celled sterile apices.

Information kindly contributed by A.M.Savoie & G.W.Saunders but may now be outdated.

Numbers of names and species: There are 7 species names in the database at present.

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.

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: 17 May 2019 by M.D. Guiry

Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=42654

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 26 October 2021.

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