155,259 species and infraspecific names are in the database, 21,864 images, 60,047 bibliographic items, 435,064 distributional records.

Streblonema Derbès & Solier, 1851

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

Holotype species: Streblonema sphaericum (Derbès & Solier) Thuret

Original publication and holotype designation:

Taxonomic status: currently recognized as a distinct genus.

Gender: This genus name is currently treated as neuter.

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: The genus is characterized by its non-specialized thallus organization. The species belonging to this genus are uniseriate, branched plants without specialized structures except true hairs. Unilocular and plurilocular sporangia occur together in some species, but also species with either unilocular or plurilocular sporangia occur. Culture studies have shown that many well-known species have Streblonema-like microthalli, for example Myriotrichia clavaeformis (Pedersen 1978b) and Litosiphon pusillus (Pedersen 1981a) belonging to the Tilopteridales s.l. and Sphaerotrichia divaricata (Ajisaka and Umezaka 1978), Acrothrix pacifica (Ajisaka 1979) and Stilophora rhizodes (Peters and Müller 1986) belonging to the syntagmatic Ectocarpales (Chordariales by some authors). These microthalli may under certain environmental conditions be physically connected with macrothalli. Other combinations of environmental conditions may disconnect them from the macrothallus and they may be found as seemingly independent species. The possibility that they are gametophytes also exists and if they are dioecious they may in culture behave like an independent species due to the highly selective isolation technique used by algal cultivators. Finally it cannot be excluded that Streblonema-like plants have evolved by complete suppression of the macrothallus or sexual reproduction is altogether lost. It therefore seems obvious that Streblonema is a polyphyletic genus which has evolved along different evolutionary lines. The genus is also paraphyletic as it is based on symplesiomorphic traits (Pedersen 1984). With our present knowledge it is therefore impossible to place these plants systematically.

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

Numbers of names and species: There are 88 species names in the database at present, as well as 9 infraspecific names. Of the species names, 50 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: 28 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=32870

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 23 May 2019.

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