154,918 species and infraspecific names are in the database, 21,111 images, 59,859 bibliographic items, 429,125 distributional records.

Dixoniella J.L.Scott, S.T.Broadwater, B.D.Saunders, J.P.Thomas & P.W.Gabrielson, 1992

Empire Eukaryota
Kingdom Plantae
Subkingdom Biliphyta
Phylum Rhodophyta
Subphylum Proteorhodophytina
Class Rhodellophyceae
Order Dixoniellales
Family Dixoniellaceae

Holotype species: Dixoniella grisea (Geitler) J.L.Scott, S.T.Broadwater, B.D.Saunders, J.P.Thomas & P.W.Gabrielson

Original publication and holotype designation: Scott, J.L., Broadwater, S.T., Saunders, B.D. & Thomas, J.P. (1992). Ultrastructure of vegetative organization and cell division in the unicellular red alga Dixoniella grisea gen. nov. (Rhodophyta) and a consideration of the genus Rhodella. Journal of Phycology 28: 649-660.

Precise date of publication21 October 1992

Taxonomic status: currently recognized as a distinct genus.

Most recent taxonomic treatment adopted: Schneider, C.W. & Wynne, M.J. (2007). A synoptic review of the classification of red algal genera a half a century after Kylin's "Die Gattungen der Rhodophyceen". Botanica Marina 50: 197-249.

Description: Spherical unicell surrounded by a mucilaginous sheath. Cell diameter 8.5-17.0 um (excluding sheath) up to 30 um with sheath. Single chloroplast with lobes radiating from a slightly eccentric pyrenoid. Olive green to grayish green in colour. A peripheral limiting thylakoid is always present adjacent to the chloroplast envelope. Pyrenoid is traversed by thylakoids lacking phycobilisomes. Dictyosomes always perinuclear. Peripheral endoplasmic reticulum tubule system present along entire cell circumference just inside plasmalemma. Usually one nucleus/cell. Pair of nucleus-associated organelles (NAO) with ring morphology present. Metaphase nucleus with a single large gap in the nuclear envelope at each pole. Asexual reproduction presumably by binary fission. Sexual reproduction unknown.

Information contributed by: M. Hawkes. The most recent alteration to this page was made on 31 Jul 2012 by Wendy Guiry.

Numbers of names and species: There is only one species or infraspecific name in the database at present, which has 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):

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Verification of data
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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: 31 July 2012 by Wendy Guiry

Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=42895

Citing AlgaeBase
Please cite this record as:
Wendy 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 March 2019.

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