Calosiphonia P.& H. , 1852
Holotype species: Calosiphonia finisterrae P.Crouan & H.Crouan
Currently accepted name for the type species: Calosiphonia vermicularis (J.Agardh) F.Schmitz
Original publication and holotype designation: [Crouan, P.L. & Crouan, H.M.] (1852). Algues marines du Finistère. Vol. 1-3 pp. Premier volume, Fucóïdees: 1 Apr 1852 (signed on p. ), p. -, 1 -112 specimens with detailed labels, [vii, index]. Deuxième volume, Floridées: 1852, p. -, 113-322, id., [iv-xi, index]. Troisième volume, Zoospermées: 1852, p. [l]-, 323-4. Brest: chez Crouans frères, pharmaciens.
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.
Monotypic when first introduced. - (23 Jan 2017) - M.D. Guiry
Description: All vegetative cells are uninucleate. Supporting cells are monocarpogonial, the carpogonial branches capable of being interpreted as either 3-celled and borne on a supporting cell with a rudimentary vegetative branch on it, or as a 4-celled carpogonial branch, the basal cell of which bears a possible remnant of a second carpogonial branch. Fertilized carpogonia issue up to 3 connecting filaments and may or may not form a direct connection to the supporting cell. Gonimoblasts arise thallus-outwardly from a point on the auxiliary cell opposite the site of fusion with the connecting filament. Spermatangia occur in clusters on outer cortical cells. Carpospores may either germinate to form discs from which gametangial thalli arise directly, or may produce crusts that release cruciate tetrasporangia. The major anatomical study of the genus is that of J. Feldmann (1954), whereas life history observations have been made by Mayhoub (1973, 1975).
Information contributed by: G.T. Kraft. The most recent alteration to this page was made on 23 Jan 2017 by M.D. Guiry.
Comments: Group contains uniaxial plants lacking secondary pit connections between vegetative cells and having generally soft, flaccid gametophytes of gelatinous texture. Plants are non-procarpic, the fertilized carpogonia producing lengthy, usually elaborately branched connecting filaments that fuse with intercalary auxiliary cells differentiating from inner cells of the cortical fascicles, the connecting filaments continuing growth after each fusion to effect further fusions to auxiliary cells. Cystocarps are fully embedded in the axes without surrounding filaments or pericarps. They are globular, composed almost entirely of carposporangia, and either arise from the auxiliary cells directly (Calosiphonia) or from sites on the connecting filaments at varying distances from the auxiliary cells (Schmitzia). Most species are monoecious, and isomorphic tetrasporophytes are unknown. When present, tetrasporophytes are diminutive crusts, although in some instances a free-living diploid phase appears to be absent from the life history. A group with some of the putatively most primitive of the red algae, based on the simplicity of construction, plasticity of vegetative and reproductive parts, lack of secondary pit connections, and almost complete lack of sterile cells in the carposporophyte. From this group came plants that formed the basis of a classic and beautifully illustrated work on fertilization and gonimoblast development in the Rhodophyta (Bornet and Thuret, 1876). Distribution: The type species is of infrequent and usually deep-water occurrence in the Mediterranean Sea, Brittany, and the southern British Isles. The second species, C. dalmatica (Kützing) DeToni, is known from Yugoslavia and Marseilles (Huve, 1970), but is even more rare.
Numbers of names and species: There are 7 species names in the database at present, of which 3 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=32994
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 15 November 2018.