153,208 species and infraspecific names are in the database, 20,952 images, 59,247 bibliographic items, 409,069 distributional records.

Hydrocoleum Kützing ex Gomont, 1892

Classification:
Empire Prokaryota
Kingdom Eubacteria
Subkingdom Negibacteria
Phylum Cyanobacteria
Class Cyanophyceae
Subclass Oscillatoriophycidae
Order Oscillatoriales
Family Microcoleaceae

Lectotype species: Hydrocoleum homoeotrichum Kützing ex Gomont

Original publication:Gomont, M. (1892). Monographie des Oscillariées (Nostocacées homocystées). Annales des Sciences Naturelles, Botanique, Série 7 15: 263-368, pls 6-14 [VI-XIV in text and expl. pl.].
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Type designated in Gardner, N.L. (1932). The Myxophyceae of Porto Rico and the Virgin Islands. In: Scientific Survey of Porto Rico and the Virgin Islands. Volume VIII. Part 2. (Anon. Eds), pp. 249-311. New York: New York Academy of Sciences.
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Taxonomic status: currently recognized as a distinct genus.

Most recent taxonomic treatment adopted: Komárek, J., Kastovsky, J., Mares, J. & Johansen, J.R. (2014). Taxonomic classification of cyanoprokaryotes (cyanobacterial genera) 2014, using a polyphasic approach. Preslia 86: 295-335.

Nomenclatural notes
Palinska et al. (2015: 152) insist that Kützing's generic description of Hydrocoleum...remains valid. - (12 Mar 2018) - Wendy Guiry

Description: Filamentous; filaments rarely solitary, usually joined in flattened mats or small compact strata, composed of gelatinous, longitudinally stratified or lamellated, usually colorless, rarely yellow-brown sheaths, which are sometimes diffluent at the margin, enclosing one or several, more or less parallel situated trichomes; old sheaths sometimes densely crosswise lamellated. Filaments sometimes branched (only sheaths). Trichomes cylindrical, usually unconstricted or slightly constricted at the crosswalls, sometimes slightly narrowed to the ends. Cells more or less isodiametric or slightly shorter or longer than wide; end cells cylindrical or conical, outside rounded, sometimes with thickened outer cell wall or with narrow calyptra. At crosswalls slight granulation. Trichomes usually motile (gliding) within sheaths. Cell division crosswise; daughter cells grow more or less into the original size before the next division. Reproduction by motile hormogonia; fragmentation of trichomes by help of necridic cells. Different species known from the periphyton in streaming, usually clear waters, or in lakes or marine littorals (growing on sand, stones or macro algae). Two species with calcareous precipitations in sheaths (growing in waters in limestone areas). One species was described from periphyton on water plants in tropical swamps (Angola).

Information contributed by: J. Komárek. The most recent alteration to this page was made on 3 Mar 2015 by M.D. Guiry.

Numbers of names and species: There are 49 species names in the database at present, as well as 10 infraspecific names. Of the species names, 23 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
Palinska, K.A., Abed, R.M.M., Charpy, L., Langlade, M.-J., Beltrán-Magos, Y. & Golubic, S. (2015). Morphological, genetic and physiological characterization of Hydrocoleum, the most common benthic cyanobacterium in tropical oceans . European Journal of Phycology 50(2): 139-154.

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: 03 March 2015 by M.D. Guiry

Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=43077

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 15 October 2018.

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