Stichococcus Nägeli, 1849
Holotype species: Stichococcus bacillaris Nägeli
Original publication and holotype designation: Nägeli, C. (1849). Gattungen einzelliger Algen, physiologisch und systematisch bearbeitet. Neue Denkschriften der Allg. Schweizerischen Gesellschaft für die Gesammten Naturwissenschaften 10(7): i-viii, 1-139, pls I-VIII.
Taxonomic status: currently recognized as a distinct genus.
Most recent taxonomic treatment adopted: Tsarenko, P.M. (2011). Trebouxiophyceae. In: Algae of Ukraine: diversity, nomenclature, taxonomy, ecology and geography. Volume 3: Chlorophyta. (Tsarenko, P.M., Wasser, S.P. & Nevo, E. Eds), pp. 61-108. Ruggell: A.R.A. Gantner Verlag K.-G..
Karsten et al. (2005: fig.1), Darienko et al (2010: fig.1) and Neustupa et al. (2011: fig. 22) place this genus in the Prasiola-clade of the Trebouxiophyceae. - (11 Mar 2011) - Wendy Guiry
Description: Filaments usually few-celled, fragmenting because of poor coherence of individual cells, uniseriate and unbranched, straight or sigmoid. Polar cells of filaments with rounded ends. Cell walls thin, without gelatinous sheath. Cells cylindrical and elongate, sometimes slightly oval. Chloroplast single, parietal and laminate, incompletely encircling cell lumen and not lobed along longitudinal margin, without pyrenoids. Cells with single central nucleus and often with polar vacuoles. Reproduction by fragmentation of filaments and multiplication of cells by vegetative cell division.
Information contributed by: G.M. Lokhorst. The most recent alteration to this page was made on 12 Sep 2014 by M.D. Guiry.
Comments: Stichococcus is cosmopolitan with a wide ecological distribution (sub)aerial from tree bark and greenhouses; phycobiont in lichens; terrestrial in alpine soils; cryobiontic from Antarctica causing greenish snow; aquatic in various freshwater habitats; one species from brackish and marine habitats. Stichococcus previously distinguished from the closely related Klebsormidium with difficulty. Using light microscopy it was concluded the former could be distinguished based on pyrenoid and motile cell absence (both present in Klebsormidium). Pyrenoids later discovered in Stichococcus chloranthus removing one character. Stichococcus invariably lacks pyrenoids in field material. These genera easily distinguished at present based filament dispersal by added pectinase, and accumulated of sorbitol at high salinities (neither feature in Klebsormidium). Ultrastructural studies of S. chloranthus show cytokinesis by centripetal growth of furrow, finally impinging upon persistent telophase spindle microtubules, without a phycoplast. Stichococcus highly variable, and in culture, during rapid growth, a helicoid chloroplast observed. Stichococcus readily cultured with S. bacillaris a suitable experimental system for physiological studies including regulation of glucose transport, and amino acid composition of proteins.
Numbers of names and species: There are 47 species names in the database at present, as well as 3 infraspecific names. Of the species names, 26 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.
Darienko, T., Gustavs, L., Mudimu, O., Menendez, C.R., Schumann, R., Karsten, U., Friedl, T. Proschold, T. (2010). Chloroidium, a common terrestrial coccoid green alga previously assigned to Chlorella (Trebouxiophyceae, Chlorophyta). European Journal of Phycology 45(1): 79-95.
Karsten, U., Friedl, T., Schumann, R., Hoyer, K. & Lembcke, S. (2005). Mycosporine-like amino acids and phylogenies in green algae: Prasiola and its relatives from the Trebouxiophyceae (Chlorophyta). Journal of Phycology 41: 557-566.
Neustupa, J., Eliás, M., Skaloud, P., Nemcová, Y. & Sejnohová, L. (2011). Xylochloris irregularis gen. et sp. nov. (Trebouxiophyceae, Chlorophyta), a novel subaerial coccoid green alga. Phycologia 50(1): 57-66.
Sluiman, H.J., Guihal, C. & Mudimu, O. (2008). Assessing phylogenetic affinities and species delimitations in Klebsormidiales (Streptophyta): nuclear-encoded rDNA phylogenies and ITS secondary structure models in Klebsormidium, Hormidiella, and Entransia. Journal of Phycology 44(1): 183-195.
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: 12 September 2014 by M.D. Guiry
Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=38330
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 20 November 2018.