154,895 species and infraspecific names are in the database, 21,111 images, 59,855 bibliographic items, 429,125 distributional records.

Hapalosiphon Nägeli ex É.Bornet & C.Flahault, 1886

Classification:
Empire Prokaryota
Kingdom Eubacteria
Subkingdom Negibacteria
Phylum Cyanobacteria
Class Cyanophyceae
Subclass Nostocophycidae
Order Nostocales
Family Hapalosiphonaceae

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.

Taxonomic status: currently recognized as a distinct genus.

Gender: This genus name is currently treated as masculine.

Most recent taxonomic treatment adopted: Komárek, J., Kastovsky, J., Mares, J. & Johansen, J.R. (2014). Taxonomic classification of cyanoprokaryotes (cyanobacterial genera) 2014, using a polyphasic approach. Preslia 86: 295-335.

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 3 Mar 2015 by M.D. Guiry.

Numbers of names and species: There are 43 species names in the database at present, as well as 39 infraspecific names. Of the species names, 28 have been flagged as accepted taxonomically on the basis of the listed literature under the species name. In some instances, opinions on taxonomic validity differ from author to author and users are encouraged to form their own opinion. AlgaeBase is a work in progress and should not be regarded as a definitive source only as a guide to the literature..

Names: ('C' indicates a name that is accepted taxonomically; 'S' a homotypic or heterotypic synonym; 'U' indicates a name of uncertain taxonomic status, but which has been subjected to some verification nomenclaturally; 'P' indicates a preliminary AlgaeBase entry that has not been subjected to any kind of verification. For more information on a species click on it to activate a link to the Species database):

Click here to also show infraspecific names in the list below.

Verification of data
Users are responsible for verifying the accuracy of information before use, as noted on the website Content page.

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.

Created: 11 April 2002 by M.D. Guiry

Verified by: 03 March 2015 by M.D. Guiry

Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=43622

Citing AlgaeBase
Please cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 2019. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 20 March 2019.

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