158,859 species and infraspecific names are in the database, 22,385 images, 61,541 bibliographic items, 456,692 distributional records.

Auxenochlorella (I.Shihira & R.W.Krauss) T.Kalina & M.Puncochárová , 1987

Empire Eukaryota
Kingdom Plantae
Subkingdom Viridiplantae
Infrakingdom Chlorophyta infrakingdom
Phylum Chlorophyta
Subphylum Chlorophytina
Class Trebouxiophyceae
Order Chlorellales
Family Chlorellaceae

Holotype species: Auxenochlorella protothecoides (Krüger) Kalina & Puncochárová

Original publication and holotype designation: Kalina, T. & Puncochárová, M. (1987). Taxonomy of the subfamily Scotiellocystoideae Fott 1976 (Chlorellaceae, Chlorophyceae). Algological Studies 45: 473-521.

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..

Taxonomic notes
Based on Chlorella subg. Auxenochlorella I. Shihira et R. W. Krauss, 1965. - (6 Nov 2011) - M.D. Guiry

Description: Unicellular microscopic algae with globose or broadly ellipsoid cells (1.5-) 3-6 (-9) µm in diameter not embedded in mucilage. Cell wall smooth, ultrastructurally with inner polysaccharide and outer trilamellate layers. Cells with single eccentric nucleus (without nucleolus); chloroplast single and parietal, without pyrenoids and secondary carotenoids; starch production limited. Asexual reproduction by autospores, 2-8 (-16) per sporangium, released by rupture of parental cell walls which remain distinct in culture. Spores initially attached, later dispersing. Sexual reproduction and flagellated stages unknown.

Information contributed by: T. Kalina & D. Garbary. The most recent alteration to this page was made on 27 Nov 2018 by M.D. Guiry.

Comments: Auxenochlorella si reported on the sap secreted from Populus and Ulmus trees from one site in Germany. Growth auxotrophic and cells require thiamin and are incapable of utilizing nitrates as nitrogen source. Cultures can grow in light or dark with addition of suitable organic nitrogen sources. Cell walls with acetoresistant material, but production not associated with trilamellar plates; old cultures with yellow green color. Chemotaxonomy of pigments supports recognition of genus. Genus distinguished from Chlorella in part, based on cell wall structure. 18S rRNA confirms distinctiveness of genus from Chlorella and suggests an affinity with Prototheca.

Numbers of names and species: There are 3 species names in the database at present, as well as 4 infraspecific names. Of the species names, 3 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.

Kalina, T. (1996). Glaphyrella, a new generic name, proposed for Chlorella saccharophila group (Chlorophyceae). European Journal of Phycology 31(Suppl.): 35, abstract 246.

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: 16 April 2003 by M.D. Guiry

Verified by: 20 December 2011 by M.D. Guiry

Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=45154

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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 07 August 2020.

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