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

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.

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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 2024-04-22 by M.D. Guiry.

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

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..

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.

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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Some of the descriptions included in AlgaeBase were originally from the unpublished Encyclopedia of Algal Genera, organised in the 1990s by Dr Bruce Parker on behalf of the Phycological Society of America (PSA) and intended to be published in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=45154

Citing AlgaeBase
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 22 April 2024. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 21 November 2024