153,622 species and infraspecific names are in the database, 20,981 images, 59,421 bibliographic items, 412,629 distributional records.

Helicodictyon L.A.Whitford & G.J.Schumacher, 1996

Classification:
Empire Eukaryota
Kingdom Plantae
Subkingdom Viridiplantae
Infrakingdom Chlorophyta infrakingdom
Phylum Chlorophyta
Subphylum Chlorophytina
Class Ulvophyceae
Order Ulotrichales
Family Helicodictyaceae

Holotype species: Helicodictyon planctonicum (L.A.Whitford) L.A.Whitford & G.J.Schumacher

Currently accepted name for the type species: Rhexinema planctonicum (L.A.Whitford) Darienko & Pröschold

Original publication and holotype designation: Whitford, L.A. & Schumacher, G.J. (1966). Helicodictyon nom. nov. pro Heterodictyon and Helicodictyaceae fam. nov. (Ulotrichales). Phycologia 5: 274-276.

Taxonomic status: currently regarded as a synonym of Rhexinema.

Most recent taxonomic treatment adopted: Škaloud, P., Rindi, F., Boedeker, C. & Leliaert, F. (2018). Süßwasserflora von Mitteleuropa. Freshwater flora of central Europe. Bd 13. Chlorophyta: Ulvophyceae (Krienitz, L. ed.). pp. [i]-vii, [1]-288, 182 figs. Berlin: Springer Spektrum.

Description: Buoyant colonies composed of short filaments which enclose a gas bubble at the colony centre. The cells excrete an extensive, transparent, homogeneous mucilaginous envelope surrounding the entire colony. Cells uninucleate, cylindrical, usually peculiarly curved, containing a parietal chloroplast with one distinct pyrenoid. Asexual reproduction by colony fragmentation and by biflagellate zoospores. Gas bubbles develop within the small daughter colonies. Sexual reproduction by isogamy.

Information kindly contributed by Skaloud <i>et al.</i> (2018: 121). but may now be outdated.

Numbers of names and species: There is only one species or infraspecific name in the database at present, which has 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):

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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.

Created: 17 August 2004 by M.D. Guiry

Verified by: 15 March 2018 by M.D. Guiry

Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=44555

Citing AlgaeBase
Please cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 2018. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 20 November 2018.

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