152,923 species and infraspecific names are in the database, 20,947 images, 59,143 bibliographic items, 408,271 distributional records.

Rhabdonia J.D.Hooker & Harvey, 1847

Classification:
Empire Eukaryota
Kingdom Plantae
Subkingdom Biliphyta
Phylum Rhodophyta
Subphylum Eurhodophytina
Class Florideophyceae
Subclass Rhodymeniophycidae
Order Gigartinales
Family Areschougiaceae

Lectotype species: Rhabdonia coccinea (Harvey) Harvey

Original publication:Harvey, W.H. & Hooker, J.D. (1847). LV. Algae L.. In: The botany of the Antarctic voyage of H.M. discovery ships Erebus and Terror, in the years 1839-1843, under the command of Captain Sir James Clark Ross, Kt., R.N., F.R.S., etc. by Joseph Dalton Hooker, M.D., R.N., F.L.S., assistant surgeon of the "Erebus" and botanist to the expedition. Vol. 1. Flora antarctica. Part I. Botany of Lord Auckland's Group and Campbell's Island. (Hooker, J.D. Eds), pp. 454-502. London: L. Reeve.
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Type designated in Schmitz, F. (1889). Systematische Übersicht der bisher bekannten Gattungen der Florideen. Flora oder Allgemeine botanische Zeitung 72: 435-456, pl. XXI.
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Taxonomic status: currently recognized as a distinct genus.

Most recent taxonomic treatment adopted: Kylin, H. (1956). Die Gattungen der Rhodophyceen. pp. i-xv, 1-673, 458 figs. Lund: C.W.K. Gleerups.

Description: Plants of the largest species reach 25 cm in length. Thalli are erect from a discoid or fibrous holdfast and are either cylindrical or segamented into clavate to elongate ovoid segments. Fronds are uniaxial, cells of the central axial filament giving rise to a single periaxial cell in 3 longitudinal planes. The medulla is broad and filamentous, the central axial filament being indistinct except at the apices. The cortex is narrow and consists of large inner and small outer cells. Carpogonial branches are 3(-4)-celled, with the basal cell occasionally bearing a sterile cell. Fertilized carpogonia emit a single connecting filament. Auxiliary cells are intercalary in a cortical filament of deeply staining and enlarged cells (an "auxiliary cell complex"). Carposporophytes consist of a central fusion cell that incorporates cells of the cortical filament subtending the auxiliary cell, but not cells of the central axial filament, the fusion cell distally being surrounded by a few layers of radiating gonimoblast cells bearing short chains of carposporangia. Cystocarps are embedded in the axes, communicate externally by an ostiole, and lack or have only a rudimentary filamentous hull around the inner pericarp. Gametophytes are monoecious, the spermatangial mother cells occurring in surface patches. Tetrasporangia are laterally pit-connected and scattered in the cortex.

Information contributed by: G.T. Kraft. The most recent alteration to this page was made on 7 Oct 2010 by M.D. Guiry.

Comments: The anatomy of the genus has been detailed by Min-Thein and Womersley (1976), who treated it as the type of the family Rhabdoniaceae. Gabrielson and Hommersand (1982) transferred it to the Solieriaceae as a member of the tribe Solierieae. Distribution: Although several species of supposed Rhabdonia have been described from such extra-Australian localities as South and eastern Africa, the Marquesas Islands, the Canary Islands and Thailand, the only verifiable members are those treated by Min-Thein and Womersley, all of which are endemic to southern Australia. Mshigeni and Papenfuss (1981) have recently removed the east African species to Solieria because of its multiaxial, rather than uniaxial, construction.

Numbers of names and species: There are 26 species names in the database at present, as well as 2 infraspecific names. Of the species names, 5 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.

References
Papenfuss, G.F. & Edelstein, T. (1974). The morphology and taxonomy of the red alga Sarconema (Gigartinales: Solieriaceae). Phycologia 13(1): 31-43, 25 figs.

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

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Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=35131

Citing AlgaeBase
Please cite this record as:
Guiry, M.D. & Guiry, G.M. 2018. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 22 September 2018.

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