159,871 species and infraspecific names are in the database, 22,563 images, 61,900 bibliographic items, 468,408 distributional records.

Georgiella Kylin, 1956

Classification:
Empire Eukaryota
Kingdom Plantae
Subkingdom Biliphyta
Phylum Rhodophyta
Subphylum Eurhodophytina
Class Florideophyceae
Subclass Rhodymeniophycidae
Order Ceramiales
Family Callithamniaceae
Subfamily Callithamnioideae
Tribe Callithamnieae

Holotype species: Georgiella confluens (Reinsch) Kylin

Original publication and holotype designation: Kylin, H. (1956). Die Gattungen der Rhodophyceen. pp. i-xv, 1-673, 458 figs. Lund: C.W.K. Gleerups.

Taxonomic status: currently recognized as a distinct genus.

Most recent taxonomic treatment adopted: Hommersand, M.H., Freshwater, D.W., Lopez-Bautista, J.M. & Fredericq, S. (2006). Proposal of the Euptiloteae Hommersand et Fredericq, trib. nov. and transfer of some southern hemisphere Ptiloteae to the Callithamnieae (Ceramiaceae, Rhodophyta). Journal of Phycology 42: 203-225.

Description: Thallus to 50 cm tall, abundantly branched with indeterminate branches, sometimes appearing subdichotomous, and determinate branchlets, distichous, flattened. Apical cell obliquely divided alternately to left and right, apex not overtopped by lateral branches. Axes corticated from near apex with ascending and descending filaments bearing transverse branches. Cells uninucleate. Procarps borne near apex of fertile branchlet with 4-celled carpogonial branch on first-formed of two opposite pericentral cells. Auxiliary cells cut off from both pericentral cells, one or both fusing by means of connecting cells with carpogonium to produce 1 or 2 carposporophytes each with globose clusters of carposporangia protected by tetrastichous involucre of lateral branches from below. Spermatangia in superficial sori. Tetrasporangia usually terminal on short filaments on branchlets, tetrahedrally- or irregularly-divided.

Information contributed by: E.M. Wollaston. The most recent alteration to this page was made on 13 Jan 2015 by M.D. Guiry.

Comments: Known only from cold seas of Antarctic region including the Scotia Arc, Antarctic Peninsula and East Antarctica, from 5 to 15(-23) m deep.

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):

Click here to also show infraspecific names in the list below.

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

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: 30 December 2000 by M.D. Guiry

Verified by: 13 January 2015 by M.D. Guiry

Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=42686

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 19 January 2021.

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