Aulosira O.Kirchner ex Bornet & Flahault, 1886
Lectotype species: Aulosira laxa O.Kirchner 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.
Request PDFType 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 solitary or in groups or clusters, rarely in mats, slightly irregularly coiled, sometimes more or less oriented parallel with firm, distinct, colorless sheaths enveloping one (rarely 2) trichomes, open at the ends (young trichomes without sheaths occur rarely). Trichomes of the same width along the whole length, not attenuated towards the ends, constricted at the crosswalls, uniseriate, isopolar, metameric (with several heterocytes developing regularly in certain distances from one another along the trichome). Cells cylindrical or barrel-shaped, more or less isodiametric up to longer than wide, blue-green, pale grayish blue, olive-green or reddish, very rarely with scarce aerotopes, usually with prominent granules; terminal cells not elongated, rounded. Heterocytes spherical, oval or cylindrical, usually of the same width or slightly greater than vegetative cells. Akinetes usually elongated, oval to cylindrical, rarely spherical, developing apoheterocytic (in airways between 2 heterocytes, and successively towards heterocytes), sometimes irregularly. Cells divide transverse to the trichome-axis and grow to original size before the next division; all cells capable of division, without meristematic zones. Reproduction by hormogonia escaping from sheaths and by akinetes. Mainly metaphytic species, found in unpolluted reservoirs, usually among or on submerged aquatic plants, or benthic. Several species are important members of the microflora in paddy fields. Almost all species grow in geographically limited areas, mainly in tropical regions due to special ecology.
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 feminine.
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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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=43593
Citing AlgaeBase
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 06 March 2023. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 24 December 2024
