Hapalosiphon Nägeli ex Bornet & Flahault, 1886

Lectotype species: Hapalosiphon pumilus Kirchner ex Bornet & Flahault

Currently accepted name for the type species: Hapalosiphon fontinalis Bornet

Original publication: Bornet, É. & Flahault, C. (1886 '1887'). Revision des Nostocacées hétérocystées contenues dans les principaux herbiers de France (Troisième fragment). Annales des Sciences Naturelles, Botanique, Septième série 5: 51-129.

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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: Filamentous-thallose; thallus of free, coiled filamentous clusters, joined to the substrate, later sometimes free floating in metaphyton. Filaments irregularly arcuated, with uniseriate trichomes (only rarely with some cells lengthwise divided), laterally (usually unilaterally) true-branched (T-type) and morphologically not differentiated in main and lateral trichomes, only rarely are branches slightly narrower. Sheaths thin, colorless, rarely indistinctly layered. Heterocytes intercalary, exceptionally lateral. Cells cylindrical, only rarely indistinctly constricted at crosswalls or barrel-shaped, sometimes with finely and sparsely granular content. Heterocytes intercalary, cylindrical. Sometimes occur solitary akinetes. Cells divide crosswise, without meristematic zones. Reproduction by hormogonia, separating from trichomes (usually ends of branches) by help of necridic cells. Most species grow in stagnant waters (metaphytic, littoral of lakes, swamps), usually clear and with water plants (in tropical and temperate zones), several species prefer moors and peaty waters. One species occurs in thermal waters, 2 species grow subaerophytically.

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 masculine.

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=43622

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 28 March 2024

 
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