Hydrococcus Kützing, 1833, nom. cons.
Holotype species: Hydrococcus rivularis Kützing
Original publication and holotype designation: Kützing, F.T. (1833). Beitrag zur Kenntniss über die Entstehung und Metamorphose der niedern vegetabilischen Organismen, nebst einer systematischen Zusammenstellung der hieher gehörigen niedern Algenformen. Linnaea 8: 335-384, pls VI-VIII.
Request PDFDescription: Unicellular-colonial; cells gathered first into unilayered, pseudoparenchymatous, nemato- or blastoparenchymatous, more or less circular colony covering the substrate (stones, plants), from which grow on the margin radially oriented, tightly gathered rows of cells; old colonies develop erect pseudofilaments. Pseudofilaments situated parallel, unbranched or later pseudodichotomously or pseudotetrachotomously divaricated, enveloped by thin, colorless sheaths; sheaths confluent together by their sides. Old colonies hemispherical or forming thick, on the surface granular, black-green, black-brown or violet macroscopic mats. Old parts of thallus have cells or their groups (usually with 4 or 8 cells) more separated, enveloped by their own mucilaginous sheaths, sometimes forming even sarcinoid packets. Cells spherical, oval, irregular or elongated at the ends of pseudofilaments, pale blue-green or olive-green, with more or less homogeneous content. Cell division in different planes in successive cell cycles, in marginal or erect rows prevails crosswise binary fission. Typical nanocytes not observed. Reproduction by solitary cells or by small clusters of cells. Type species known from stones, plants and wooden substrates in rapid flowing, cold streams, mainly in mountains, probably with cosmopolitan distribution (however, this species is still little known and the identity of populations from different countries must be revised). Three other species (very little known, sometimes only from one locality) have similar ecology, one species was described from the littoral of lakes. Data on Hydrococcus from saline waters and mineral lakes are questionable.
Information contributed by: J. Komárek. The most recent alteration to this page was made on 2015-03-06 by M.D. Guiry.
Taxonomic status: This name is of an entity that is currently accepted taxonomically.
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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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=43583
Citing AlgaeBase
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 06 March 2015. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 01 May 2024
