163,770 species and infraspecific names are in the database, 22,783 images, 63,043 bibliographic items, 481,350 distributional records.

Litosiphon Harvey, 1849

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

Lectotype species: Litosiphon pusillus (Carmichael) Harvey

Currently accepted name for the type species: Litosiphon laminariae (Lyngbye) Harvey

Original publication:Harvey, W.H. (1849). A manual of the British marine algae: containing generic and specific descriptions of all the known British species of sea-weeds. With plates to illustrate all the genera. pp. [i]-lii, [1]-252, 27 pls. London: John Van Voorst, Paternoster Row.
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Type designated in De Toni, G.B. (1891). Systematische √úbersicht der bisher bekannten Gattungen der echten Fucoideen. Flora 74: 171-182.

Taxonomic status: currently recognized as a distinct genus.

Gender: This genus name is currently treated as masculine.

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 on various algae, attached on hosts by rhizoidal holdfast, filiform, simple, parenchymatous, sympodial, solid, less than 10 cm in length, composed of 1- several layers of colorless medullary cells and 1-2 layers of pigmented peripheral cells containing many chloroplasts with prominent pyrenoids. Phaeophycean hairs without basal sheath abundant. Mostly spring to summer annual. Unilocular and plurilocular sporangia formed on entire surface of the thallus, scattered or in groups. Unilocular sporangia directly transformed from peripheral cells, ovate or elliptical. Plurilocular sporangia formed from daughter cells following vegetative divisions, conical or variable in shape. Direct type of asexual life history reported in L. pusillus by various authors. Embryospore shows immediate differentiation. Swarmers from unilocular sporangia and plurilocular sporangia develop into streblonematoid microthallus which form plurilocular sporangia.

Information contributed by: H. Kawai. The most recent alteration to this page was made on 18 Jul 2018 by M.D. Guiry.

Comments: Pedersen (1978) separated the species formerly placed in the genus lacking phaeophycean hairs (e.g. L. filiformis) into Pogotrichum. Pedersen (1985) also separated L. groenlandicus and L. mortensenii which have hacatonematoid microthalli and showing mediate differentiation of embryospore into Trachynema.

Numbers of names and species: There are 10 species names in the database at present, of which 1 has 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.

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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

Verified by: 18 July 2018 by M.D. Guiry

Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=32886

Citing AlgaeBase
Please cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 2021. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 17 October 2021.

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