153,318 species and infraspecific names are in the database, 20,952 images, 59,301 bibliographic items, 409,170 distributional records.

Laurencia J.V.Lamouroux, 1813, nom. cons.

Classification:
Empire Eukaryota
Kingdom Plantae
Subkingdom Biliphyta
Phylum Rhodophyta
Subphylum Eurhodophytina
Class Florideophyceae
Subclass Rhodymeniophycidae
Order Ceramiales
Family Rhodomelaceae
Tribe Laurencieae

Lectotype species: Laurencia obtusa (Hudson) J.V.Lamouroux

Original publication:Lamouroux, J.V.F. (1813). Essai sur les genres de la famille des thalassiophytes non articulées. Annales du Muséum d'Histoire Naturelle, Paris 20: 21-47, 115-139, 267-293, pls 7-13.
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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.

Gender: This genus name is currently treated as feminine.

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.

Nomenclatural notes
"J'ai dédié ce genre à M. de Lalaurencie, ancien officier de marine, inspecteur d'académie dans l'université impériale, amateur des sciences naturelles..." (Lamouroux 1813: 130). The surname is also rendered "La Laurencie." - (23 Jan 2011) - M.D. Guiry

Description: Thallus erect or decumbent, cartilaginous or not; branches arranged distichously, radially or whorled. Axes terete or flattened, with an apical pit from which an inconspicuous tuft of trichoblasts emerges. Structure polysiphonous, the central axial cells cutting off 4 pericentral cells, but these normally indistinct within a few segments of the apices. In transverse section view, the first pericentral cell is positioned underneath the trichoblast basal cell. Medulla of large hyaline cells, grading to a cortex of smaller pigmented cells. Outer cortical cells never forming a palisade, in section nearly isodiametric or radially elongate, rounded to angular; in some species with projecting outer walls. Outer cortical cells developing lateral secondary pit connections (best seen in longitudinal section), and in many species containing bright cell inclusions (corps en cerise). Medullary cells in some species with thickened opaque walls or lenticular thickenings (lens-like inclusions within medullary cells). Spermatangia forming on fertile trichoblasts. Procarp bearing a segment of 5 pericentral cells. Auxiliary cell formation after fertilisation is normal (as opposed to the delayed formation seen in Chondrophycus). Cystocarps usually lateral on fertile branchlets, conspicuous. Tetrasporangia developing from pericentral cells, tetrahedrally divided, arranged in vague lines along sides of fertile branches, parallel to the axis (parallel arrangement). Two or three pericentral cells developing from a tetrasporangial axial cell.

Information contributed by: Metti, Huisman & Millar (2018).. The most recent alteration to this page was made on 9 Oct 2018 by M.D. Guiry.

Comments: Occurring on temperate to tropical shores of the world, littoral to sublittoral up to 65 m deep

Common names

(as Laurencia)
Hawaiian: Limu lipe'epe'e (Chapman & Chapman 1980).

Numbers of names and species: There are 285 species names in the database at present, as well as 144 infraspecific names. Of the species names, 137 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. (1947). Generic names of algae proposed for conservation. I.. Madroño 9: 8-17.

Metti, Y. Huisman, J.M. & Millar, A.J.K. (2018). Laurencia. In: Algae of Australia. Marine benthic algae of north-western Australia. 2. Red algae. (Huisman, J.M. Eds), pp. 521-529. Canberra & Melbourne: ABRS & CSIRO Publishing.

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: 29 December 2000 by M.D. Guiry

Verified by: 09 October 2018 by M.D. Guiry

Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=32789

Citing AlgaeBase
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 23 October 2018.

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