155,542 species and infraspecific names are in the database, 21,916 images, 60,162 bibliographic items, 438,693 distributional records.

Leathesia S.F.Gray, 1821

Classification:
Empire Eukaryota
Kingdom Chromista
Phylum Ochrophyta
Class Phaeophyceae
Subclass Fucophycidae
Order Ectocarpales
Family Chordariaceae

Holotype species: Leathesia tuberiformis S.F.Gray

Currently accepted name for the type species: Leathesia marina (Lyngbye) Decaisne

Original publication and holotype designation: Gray, S.F. (1821). A natural arrangement of British plants, according to their relations to each other, as pointed out by Jussieu, De Candolle, Brown, &c. including those cultivated for use; with an introduction to botany, in which the terms newly introduced are explained; illustrated by figures. pp. vol. 1: [i]-xxviii, [1]- 824, pls I-XXI plates. London: Printed for Baldwin, Cradock & Joy, Paternoster-Row.
 Download PDF

Taxonomic status: currently recognized as a distinct genus.

Most recent taxonomic treatment adopted: Silberfeld, T., Rousseau, F. & Reviers, B. de (2014). An updated classification of brown algae (Ochrophyta, Phaeophyceae). Cryptogamie Algologie 35(2): 117-156.

Description: Plants epiphytic or epilithic, solitary or caespitose, hemispherical or irregularly globose, haplostichous, solid, later becoming hollow, fleshy, slimy, composed of di-trichotomously branched, loosely arranged medullary filaments radiating from basal layer and multicellular assimilatory filaments. Medullary cells large, colorless, elongated, anastomose. Assimilatory filaments composed of cylindrical pigmented cells terminated with a larger swollen cell. Each cell contains several chloroplasts with pyrenoids. Phaeophycean hairs common among assimilatory filaments. Ovoid or ellipsoid unilocular sporangia and linear plurilocular sporangia formed on the basal cells of assimilatory filaments, often on the same thalli. Culture studies of L. difformis revealed basically heteromorphic life history alternating between diploid macrothalli and haploid filamentous microthalli (Sauvageau 1925, Kylin 1933, Dangeard 1969). Plurispores of the macrothalli reproduced macrothalli, and unfused gametes of microthalli reproduced gametophytes. Inagaki (1958) classified Leathesia into 2 sections, sect. Leathesia having hollow thalli comprising reticulated medullary layer and sect. Primariae having solid thalli comprising densely packed medullary filaments. The latter resembles Corynophlaea in the inner anatomy, however, presumably different taxon. Ajisaka (1984) cultured L. japonica belonging to the sect. Primariae and reported the occurrence of erect gametophytic filaments resembling Polytretus reinboldii (Reinke) Sauvageau forming plurilocular sporangia with several lateral release pores. Distribute world-wide. Intertidal or subtidal, mostly summer annual.

Information contributed by: H. Kawai. The most recent alteration to this page was made on 20 Jun 2014 by M.D. Guiry.

Numbers of names and species: There are 31 species names in the database at present, as well as 3 infraspecific names. Of the species names, 14 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.

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: 20 June 2014 by M.D. Guiry

Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=43

Citing AlgaeBase
Please cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 2019. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 16 June 2019.

SITE © 1996 - 2019 M.D. Guiry. All rights reserved.

Website Design : 249 Design Studio