Hydrocoleum Kützing ex Gomont, 1892

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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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 2020-03-05 by M.D. Guiry.

Taxonomic status: This name is of an entity that is currently accepted taxonomically.

Gender: This genus name is currently treated as neuter.

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

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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.

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

Citing AlgaeBase
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 05 March 2020. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 09 February 2023

 
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