Lectotype species: Sphaerococcus coronopifolius Stackhouse
Original publication:Stackhouse, J. (1797). Nereis britannica; continens species omnes fucorum in insulis britannicis crescentium: descriptione latine et anglico, necnon iconibus ad vivum depictis... Fasc. 2. pp. ix-xxiv, 31-70, pls IX-XIII. Bathoniae [Bath] & Londini [London]: S. Hazard; J. White.
Type designated in Greville, R.K. (1830). Algae britannicae, or descriptions of the marine and other inarticulated plants of the British islands, belonging to the order Algae; with plates illustrative of the genera. pp. [i*-iii*], [i]-lxxxviii, -218, pl. 1-19. Edinburgh & London: McLachlan & Stewart; Baldwin & Cradock.
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.
Type was selected by Greville (1830: 137): "Of Fucus coronopifolius of authors, I have perfect individuals in all states, and it is upon this species that I found my genus." - (23 Jan 2017) - M.D. Guiry
Description: Plants reach 150 mm in length, are erect from a large discoid base, and consist of irregularly to secondly branched flattened axes. Gameotphytes are monoecious. The crustose ctetrasporophyte is characterized by intercellular oil droplets and chains of large cells among the horizontal filaments (Maggs and Guiry 1982). Plants of the family SPHAEROCOCCACEAE are uniaxial, each axial cell cutting off 4 periaxial cells bearing cortical fascicles. Procarps form near tips of lateral branches on one of the two lateral pericentral cells, the carpogonial branch consisting of 4 cells borne on an intercalary supporting cell. Although the auxiliary cell is easily identifiable by its staining properties, its position is difficult to interpret (Searles 1968: 7). It appears to be the basal cell of the carpogonial branch, as it bears no other lateral structures, a position unique in the red algae. Early postfertilization stages are not clearly known. The mature cystocarp consists of a large central fusion cell and radiating gonimoblast filaments, each of which terminates in a single or 2-celled chain of carposporangia. Spermatangia are borne in clusters on elongated outer cortical mother cells formed in surface depressions. Tetrasporophytes are heteromorphic with gametophytes, being in the form of Haematocelis fissurata-type crusts bearing zonate sporangia among sterile erect filaments (Maggs and Guiry, 1982). The family once contained a large number of genera, but is now considered to be monogeneric. Searles (1968) has made the most recent anatomical and taxonomic study of the gametophytes.
Information contributed by: G.T. Kraft. The most recent alteration to this page was made on 23 Jan 2017 by M.D. Guiry.
Comments: Distribution: The type species occurs in the eastern Atlantic from the British Isles to the Canary Islands, and in the Mediterranean and Black Seas (Dixon and Irvine 1977). In Britain it occurs on sublittoral rocks to 15 m depths. The Haematocelis fissurata stage is known from the Atlantic and Mediterranean coasts of France, Ireland and Scotland, where it occurs on bedrock and boulders from 3-24 m depth. A second species, S. rhizophvlloides Rodriguez, is infrequently collected from the Baleares Islands, Atlantic France and the western Mediterranean, sometimes at considerable depths (up to 110 m; Huve 1970).
Numbers of names and species: There are 185 species names in the database at present, as well as 54 infraspecific names. Of the species names, 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.
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: 23 January 2017 by M.D. Guiry
Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=108
Please cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 2018. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 17 October 2018.