Chlorothrix Berger-Perrot, 1982

Holotype species: Urospora kornmannii Berger-Perrot

Original publication and holotype designation: Berger-Perrot, Y. & Thomas, J.C. (1982). Étude ultrastructurale comparée du pyrénoïde et des parois dans les genres Ulothrix, Chlorothrix et Urospora. Phycologia 21: 355-369.

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Description: Unbranched, uniseriate green filaments, to 15 cm long, attached to solid substrata by discoid enlargement of basal cell and/or unicellular descending rhizoids. Cell wall primarily of three microfibrillar layers, the outermost dense and covered by a thin, smooth envelope. Mature cells 8-40 um in diameter, uninucleate. Chloroplast single per cell, girdle shaped in younger plants, becoming continuous and parietal when mature. Chloroplasts with one to several polypyramidal pyrenoids, matrix penetrated by tubular chloroplast stroma invaginations. Asexual reproduction by biflagellate, sometimes posteriorly tailed , or quadriflagellate acuminate zooids similar to Urospora. Life history haplodiplontic and heteromorphic. Sexual reproduction by biflagellate ovoid isogametes produced by filamentous gametophytes which are unisexual and haploid. Zygotes develop into unicellular, coccoid or stalked sporophytes producing quadriflagellate, acuminate and presumably meiotic zoospores, on germination giving rise to new filamentous gametophytes. All species of Chlorothix described from marine habitats from Britanny, France growing on buoys and boats at the water line and on various hard substrata in low intertidal zone. One species reported from Pacific Coast of North America as Urospora speciosa (Carm.) Leblond ex Hamel. Chlorothix appears intermediate between Acrosiphoniales and Ulotrichales. No ultrastructural studies of flagellar apparatus in motile cells or cytokinesis carried out.

Information contributed by: S. Jónsson. The most recent alteration to this page was made on 2021-02-09 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.

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Some of the descriptions included in AlgaeBase were originally from the unpublished Encyclopedia of Algal Genera, organised in the 1990s by Dr Bruce Parker on behalf of the Phycological Society of America (PSA) and intended to be published in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

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M.D. Guiry in Guiry, M.D. & Guiry, G.M. 09 February 2021. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway.; searched on 29 September 2022

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