155,259 species and infraspecific names are in the database, 21,864 images, 60,047 bibliographic items, 435,064 distributional records.

Uronema Lagerheim, 1887

Classification:
Empire Eukaryota
Kingdom Plantae
Subkingdom Viridiplantae
Infrakingdom Chlorophyta infrakingdom
Phylum Chlorophyta
Subphylum Chlorophytina
Class Chlorophyceae
Order Chaetophorales
Family Uronemataceae

Holotype species: Uronema confervicola Lagerheim

Original publication and holotype designation: Lagerheim, G. (1887). Note sur l'Uronema, nouveau genre des algues d'eau douce. Malpigia 1: 517-523.

Taxonomic status: currently recognized as a distinct genus.

Most recent taxonomic treatment adopted: Burova, O.V., Tsarenko, P.M., Kovalenko, O.V., Petlovany, O.A., Mikhailyuk, T.I. & Lilitska, G.G. (2011). Chaetophorales. In: Algae of Ukraine: diversity, nomenclature, taxonomy, ecology and geography. Volume 3: Chlorophyta. (Tsarenko, P.M., Wasser, S.P. & Nevo, E. Eds), pp. 264-278. Ruggell: A.R.A. Gantner Verlag K.-G.

Description: Filaments uniseriate, unbranched, of limited growth, attached to substratum by hyaline gelatinous holdfast ("dermoid") apparently secreted by slightly tapering basal cell. Apical cell to a different degree acuminate. Cell wall thin and not lamellate. Cells cylindrical, elongated, closely adherent to one another, uninucleate. Chloroplast single and parietal, laminate to girdle-shaped, often encircling all, or nearly all of cell lumen, typically containing more than one pyrenoid, usually up to four. Incompletely encircling chloroplast lobed along longitudinal margin. Asexual reproduction by quadriflagellate zoospore arising 1(-2) per cell. Zoospores pyriform to oval, containing a cup-shaped parietal chloroplast with distinct stigma. In arrested zoosporogenesis, aplanospores arise, mostly germinating in the parental cell. Method of sexual reproduction unknown. Presence of biflagellate swarmers (gametes?) uncertain. Uronema cosmopolitan in freshwater, occurring as benthic alga in mesotrophic and eutrophic habitats such as stagnant and weakly streaming (open) waters, also in rice-fields and epiphytic on macro-algae (Oedogonium, Cladophora) and higher plants in pools. Cytological studies indicate chromosome numbers of n=12-18. A recently modified generic diagnosis of Ulothrix included Uronema. This can be rejected based on morphological features such as the discoid holdfast, acuminate apical cell and production of one zoospore per cell. In addition, ultrastructure of cell division (cell plate, phycoplast, plasmodesmata), and structural organization of flagellar apparatus in reproductive cells clearly places these algae in evolutionary lines Ulvophyceae and Chlorophyceae, respectively.

Information contributed by: G.M. Lokhorst. The most recent alteration to this page was made on 13 Sep 2015 by M.D. Guiry.

Numbers of names and species: There are 20 species names in the database at present, as well as 4 infraspecific names. Of the species names, 14 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.

References
John, D.M. (2002). Orders Chaetophorales, Klebshormidiales, Microsporales, Ulotrichales. In: The Freshwater Algal Flora of the British Isles. An identification guide to freshwater and terrestrial algae. (John, D.M., Whitton, B.A. & Brook, A.J. Eds), pp. 433-468. Cambridge: Cambridge University Press.

Cambra Sánchez, J., Álvarez Cobelas, M. & Aboal Sanjurjo, M. (1998). Lista florística y bibliográfica de los clorófitos (Chlorophyta) de la Península Ibérica, Islas Baleares e Islas Canarias. pp. 1-614. Burgos: Asociación Española de Limnología.

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: 28 December 2000 by M.D. Guiry

Verified by: 26 January 2012 by M.D. Guiry

Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=37842

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 23 May 2019.

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