157,554 species and infraspecific names are in the database, 22,210 images, 60,976 bibliographic items, 458,858 distributional records.

Stichothamnion Børgesen, 1930

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

Holotype species: Stichothamnion cymatophilum Børgesen

Original publication and holotype designation: Børgesen, F. (1930). Marine algae from the Canary Islands especially from Tenerife and Gran Canaria III. Rhodophyceae. Part III. Ceramiales. Kongelige Danske Videnskabernes Selskab, Biologiske Meddelelser 9(1): 1-159, 60 figs.
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Taxonomic status: currently recognized as a distinct genus.

Gender: This genus name is currently treated as neuter.

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
Monotypic when first introduced. - (26 Jan 2017) - M.D. Guiry

Description: Polysiphonous, epiphytic, dorsiventral thalli with indeterminate prostrate branch system producing endogenously derived, determinate, radially oriented, upright branches. Trichoblasts colorless, rare and rudimentary on prostrate branches, very long, common and in 1/4 spiral series on upright branches; unbranched and with proximal cells last to mature. Many unicellular rhizoids on most segments of ventral prostrate axis, in a single row, thick-walled and deeply penetrating host. Apex of prostrate system straight; pericentral cells 7-9, uncorticated. Upright branches cylindrical, produced on dorsal side of prostrate branch, proximal segments with 5-6 pericentral cells, central segments with 7-9, and distal segments with fewer pericentrals forming a more or less lanceolate branch; dichotomous branching may occur in older, especially fertile branches. Germling an upright cylindrical polysiphonous, apparently determinate branch; probably endogenously developing a prostrate branch at a later time than was observed (Boergesen 1930). Reproductive structures formed on distal segments of upright branches. Tetrasporangia in terminal region, one per segment in a slight spiral series; segments somewhat swollen. Male capitula cylindrical, with a sterile tip, replacing trichoblasts on some distal segments. Procarps on second trichoblast segment that has become polysiphonous, uniseriate distal part of trichoblast soon deciduous; cystocarp ovoid-urceolate, often lateral on upright branch system.

Information contributed by: R.E. Norris. The most recent alteration to this page was made on 26 Jan 2017 by M.D. Guiry.

Comments: Only known in the Canary Islands, intertidal in strong surf, growing on Ralfsia. There seems to be no reason to separate Stichothamnion from Lophosiphonia in the present interpretation of the latter genus.

Numbers of names and species: There are 2 species names in the database at present, of which 2 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: 26 January 2017 by M.D. Guiry

Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=42520

Citing AlgaeBase
Please cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 2020. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 22 February 2020.

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