Excentrochloris Pascher, 1938

Holotype species: Excentrochloris gigas Pascher

Original publication and holotype designation: Pascher, A. (1938). Heterokonten. In: Kryptogamen-Flora von Deutschland, Österreich und der Schweiz. (Rabenhorst, L. Eds) Vol. 11, Teil 3, pp. 321-480. Leipzig: Akademische Verlagsgesellschaft.

Description: Unicellular, solitary organisms with irregularly ellipsoid, blunt polyhedral, pyriform or more or less cylindrical cells 24-50 _m long and 15-30 _m wide. Cell wall thin to thick and non ornamented. It is strongly thickened at one pole and often stratified at this end. Cell wall can form an extension which can be elongated to resemble a peduncle. Sometimes cell surrounded by thin mucilage. Each cell with numerous discoid or polyhedral chloroplasts, in some cells forming an irregular reticulum; pyrenoids absent. Young cells uninucleate but becoming multinucleate with age. Numerous oil granules present, these sometimes red. Asexual reproduction by zoospores (sometimes more than 100 spores formed in a single cell). Zoospores 6-20 _m long, with one or many chloroplasts, a stigma, contractile vacuoles, and two unequal flagella; the larger flagellum is twice as long as the cell, the shorter is a quarter the length of the larger. The zoospore posterior is strongly amoeboid. Autospores are also reported as well as resting stages in the form of aplanospores, the latter dark brown and containing numerous, orange oil granules. Excentrochloris rare in acidic streams or peat bogs, reported only from central Europe. Genus may be confused with the chlorococcalean green alga Excentrosphaera Moore.

Information contributed by: H. R. Preisig. The most recent alteration to this page was made on 2021-10-04 by M.D. Guiry.

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

Gender: This genus name is currently treated as feminine.

Most recent taxonomic treatment adopted: Kawai, H. & Nakayama, T. (2015). Introduction (Heterokontobionta p.p.), Cryptophyta, Dinophyta, Haptophyta, Heterokontophyta (except Coscinodiscophyceae, Mediophyceae, Fragilariophyceae, Bacillariophyceae, Phaeophyceae, Eustigmatophyceae), Chlorarachniophyta, Euglenophyta. In: Syllabus of plant families. Adolf Engler's Syllabus der Pflanzenfamilien. Ed. 13. Phototrophic eukaryotic Algae. Glaucocystophyta, Cryptophyta, Dinophyta/Dinozoa, Haptophyta, Heterokontophyta/Ochrophyta, Chlorarachnniophyta/Cercozoa, Chlorophyta, Streptophyta p.p. (Frey, W. Eds), pp. 11-64, 103-139. Stuttgart: Borntraeger Science Publishers.

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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=46504

Citing AlgaeBase
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 04 October 2021. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 07 May 2024