155,250 species and infraspecific names are in the database, 21,864 images, 60,043 bibliographic items, 435,057 distributional records.

Meiodiscus G.W.Saunders & McLachlan, 1991

Classification:
Empire Eukaryota
Kingdom Plantae
Subkingdom Biliphyta
Phylum Rhodophyta
Subphylum Eurhodophytina
Class Florideophyceae
Subclass Nemaliophycidae
Order Palmariales
Family Meiodiscaceae

Holotype species: Meiodiscus spetsbergensis (Kjellman) G.W.Saunders & McLachlan

Original publication and holotype designation: Saunders, G.W. & McLachlan, J.L. (1991). Morphology and reproduction of Meiodiscus spetsbergensis (Kjellman) gen. et comb. nov., a new genus of Rhodophysemataceae (Rhodophyta). Phycologia 30: 272-286.

Taxonomic status: currently recognized as a distinct genus.

Most recent taxonomic treatment adopted: Saunders, G.W., Jackson, C. & Salomaki, E.D. (2017 '2018'). Phylogenetic analyses of transcriptome data resolve familial assignments for genera of the red-algal Acrochaetiales-Palmariales complex (Nemaliophycidae). Molecular Phylogenetics and Evolution 119: 151-159, 2 fig., 3 tables.

Nomenclatural notes
Monotypic when first introduced. - (20 Jan 2017) - M.D. Guiry

Description: Thallus composed of uniseriate filaments in erect and prostrate axes. Filaments of prostrate axes laterally adherent to form a compact, pseudoparenchymatous monostromatic disc with cell fusions. Erect filaments free, variable in length, arising singly or in groups from the prostrate disc. Branching irregular. Chloroplasts several per cell, parietal, ribbon-shaped to discoid, containing B-phycoerythrin. Gametangial plants unknown. Tetrasporangia formed terminally, regenerating repeatedly from a basal generative stalk cell. Spores regularly cruciately or decussately arranged. Tetraspores give rise in culture to further tetrasporangial plants.

Information contributed by: M.D. Guiry. The most recent alteration to this page was made on 16 Apr 2018 by M.D. Guiry.

Comments: This recently described monotypic genus is based on a cold-water species widely known as Rhodochorton penicilliforme (Kjellman) Rosenvinge. A chromosome number of 24 was noted by Saunders and McLachlan (1991) for plants with tetrasporangia and therefore putatively diploid. A chromosome number of 12-14 was noted by West (1970) for the closely related Rhodochorton concrescens K.M. Drew, thought to be closely related to M. spetsbergensis by Guiry in Irvine et al. (1975).

Numbers of names and species: There are 2 species names in the database at present, of which 2 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.

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: 16 April 2018 by M.D. Guiry

Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=37659

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 21 May 2019.

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