Cylindrospermum Kützing ex Bornet & Flahault, 1886

Lectotype species: Cylindrospermum majus Kützing ex Bornet & Flahault

Original publication: Bornet, É. & Flahault, C. (1886 '1888'). Revision des Nostocacées hétérocystées contenues dans les principaux herbiers de France (quatrième et dernier fragment). Annales des Sciences Naturelles, Botanique, Septième Série 7: 177-262.

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Type designated in: Geitler, L. (1942). Schizophyta: Klasse Schizophyceae. In: Die natürlichen Pflanzenfamilien, Sweite Auflage. (Engler, A. & Prantl, K. Eds) Vol.1b, pp. 1-232. Leipzig: Wilhelm Engelmann.

Description: Filaments in fine or compact, mucilaginous mats, slightly curved or irregularly coiled, cylindrical along the whole length or slightly narrowed in the middle, without sheaths, but with very fine, colorless, homogeneous, diffluent mucilage, symmetrical, constricted at the crosswalls. Cells cylindrical, more or less isodiametric or longer than wide, rarely barrel-shaped or almost spherical, without aerotopes, sometimes with dispersed granules and visible chromatoplasm, pale or bright blue-green. Heterocytes always only terminal (arise from end cells), ovoid, oval or conical, unipored, developing at both ends of trichomes, rarely only at the one end (facultatively ?). Akinetes develop only close to heterocytes, at both trichome ends, rarely spherical, usually oval or cylindrical, solitary or in rows up to 7, sometimes with sculptured outer cell wall layers. Cells divide crosswise and grow more or less into the original size before the next division. Without meristematic zones, all cells capable of dividing. Reproduction by trichome fragmentation into hormogonia and by akinetes. Mainly periphytic species, growing in benthos, on aquatic plants and submerged woody and stony substrates, usually in unpolluted or slightly eutrophic waters. Several species grow in soils. Mainly with geographically limited areas.

Information contributed by: J. Komárek. The most recent alteration to this page was made on 2023-03-06 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 neuter.

Most recent taxonomic treatment adopted: Strunecký, O., Ivanova, A.P. & Mares, J. (2022 '2023'). An updated classification of cyanobacterial orders and families based on phylogenomic and polyphasic analysis (Review). Journal of Phycology 59(1): 12-51.

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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. 06 March 2023. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway.; searched on 19 June 2024

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