Pseudocharacium Korshikov, 1953
Holotype species: Pseudocharacium acuminatum Korshikov
Original publication and holotype designation: Korshikov, A.A. (1953). Viznachnik prisnovodnihk vodorostey Ukrainsykoi RSR [Vyp] V. Pidklas Protokokovi (Protococcineae). Bakuol'ni (Vacuolales) ta Protokokovi (Protococcales) [The Freshwater Algae of the Ukrainian SSR. V. Sub-Class Protococcineae. Vacuolales and Protococcales]. pp. 1-439. Kyjv [Kiev]: Akad. NAUK URSR.
Taxonomic status: currently recognized as a distinct genus.
Gender: This genus name is currently treated as neuter.
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, -288, 182 figs. Berlin: Springer Spektrum.
Description: Unicellular algae attached to the substrate by a mucilaginous pad or short but distinct stipe. Cells ovoid, ellipsoid to spindle shaped, sometimes slightly curved. Cells uninucleate when young, later becoming multinucleate with nuclei randomly distributed in the cytoplasm. Cells with a parietal chloroplast with one to several pyrenoids; pyrenoids surrounded by a smooth, continuous ring of starch. Cell wall thin in young cells, becoming thick in mature cells and sporangia. Asexual reproduction by quadriflagellate zoospores, ovoid, tapering at the anterior end; 16 or more zoospores are produced per sporangium, and released through a lateral rupture of the sporangial wall. Zoospores naked, with anterior contractile vacuoles situated near the flagellar bases, a median to posterior stigma, and a single parietal chloroplast with pyrenoid; zoospores attaching to the substrate with the anterior end, followed by retraction of the flagella. Sexual reproduction unknown.
Information contributed by: Skaloud et al. (2018: 170).. The most recent alteration to this page was made on 16 Mar 2018 by M.D. Guiry.
Comments: Accordking to Skaloud et al. (2018: 170), Pseudocharacium is morphologically very similar to Characium but can be distinguished by the quadriflagellate zoospores. The genus includes three freshwater species, growing as epiphytes on macroalgae and other macrophytes. Type species is Pseudocharacium acuminatum. DNA sequence data is only available for P. americanum. The taxonomic position of the other species will need to be examined using molecular data.
Numbers of names and species: There are 3 species names in the database at present, as well as 1 infraspecific names. Of the species names, 3 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.
Watanabe, S. & Nakayama, T. (2007). Ultrastructure and phylogenetic relationships of the unicellular green algae Ignatius tetrasporus and Pseudocharacium americanum (Chlorophyta). Phycological Research 55: 1-16.
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.
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: 23 April 2002 by M.D. Guiry
Verified by: 16 March 2018 by M.D. Guiry
Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=44266
Please cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 2020. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 25 October 2020.