Chlorococcum, 1842, nom. cons.
Holotype species: Chlorococcum infusionum (Schrank) Meneghini
Original publication and holotype designation: Meneghini, G. (1843). Monographia Nostochinearum italicarum addito specimine de Rivulariis. Memorie della Reale Accademia delle Scienze di Torino, ser. 2 5: 1-143, pls I-XVII.
Taxonomic status: currently recognized as a distinct genus.
Most recent taxonomic treatment adopted: Tsarenko, P.M. (2011). Chlorococcales. In: Algae of Ukraine: diversity, nomenclature, taxonomy, ecology and geography. Volume 3: Chlorophyta. (Tsarenko, P.M., Wasser, S.P. & Nevo, E. Eds), pp. 232-264. Ruggell: A.R.A. Gantner Verlag K.-G..
The name and the type has been conserved. - (8 Nov 2017) - M.D. Guiry
Description: Vegetative cells solitary or in temporary groups of indefinite form, never embedded in gelatin. Cells ellipsoidal to spherical and vary in size. Cell walls smooth. Parietal chloroplast with or without a peripheral opening and with one or more pyrenoids. Cells uniucleate, or multinucleate just prior to zoosporogenesis. Reproduction by zoospores, aplanospores, or isogametes. Motile cells have two equal flagella and remain ellipsoidal for a time after motility ceases (Chlamydomonas-type). This free-living genus is cosmopolitan.
Information contributed by: T.R. Deason, emend, Shin, Watanabe & Lewis (Watanabe & Lewis, 2017: 337). The most recent alteration to this page was made on 12 May 2020 by M.D. Guiry.
Comments: Ultrastructure studies have shown that a phycoplast is present in at least some species and that the zoospores have clockwise absolute orientation of their basal bodies. Though primarily an edaphic alga, it has been reported from such diverse habitats as hot springs in Central Asia and soils collected in Antarctica. Aquatic, marine, and aerial isolates have been recorded. Physiological studies of several species have determined the effect of various nutrients and inhibitors on growth. The ability to produce certain enzymes and secondary carotenoids also has been determined. A serological study was performed to determine the relationship between Chlorococcum and Tetracystis which differs morphologically only in the ability of the latter to form tetrads by desmoschisis.
Numbers of names and species: There are 95 species names in the database at present, as well as 2 infraspecific names. Of the species names, 47 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.
Watanabe, S. & Lewis, L.A. (2017). Phylogenetic interpretation of light and electron microscopic features of selected members of the phylogroup Moewusinia (Chlorophyceae), with new generic taxonomy. Phycologia 56(3): 329-353, 77 fig., 2 tables.
Silva, P.C. & Starr, R.C. (1953). Difficulties in applying the International Code of Botanical Nomenclature to certain unicellular algae, with special reference to Chlorococcum. Svensk Botanisk Tidskrift 47: 235-247.
Verification of data
Users are responsible for verifying the accuracy of information before use, as noted on the website Content page.
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: 19 October 2015 by M.D. Guiry
Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=37477
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 October 2020.