Binuclearia Wittrock, 1886
Holotype species: Binuclearia tatrana Wittrock
Currently accepted name for the type species: Binuclearia tectorum (Kützing) Beger ex Wichmann
Original publication and holotype designation: Wittrock, V.B. (1886). Om Binuclearia, ett nytt confervacé-slägte. Bihang til Kongliga Svenska Vetenskaps-Akademiens Handlingar 12 Afdelning III(1): 1-10, 1 pl.
Precise date of publication: post 10 February 1886
Description: Unbranched uniseriate filaments, first attached to the substrate by a mucilaginous disc, later free-floating, enclosed within a thick mucilaginous sheath. Cells cylindrical, with thick and lamellated cell walls, marked by thickened and prominently stratified transverse septa. In older cells transverse septa become greatly thickened and prominently striated. Protoplasts uninucleate, ovoid to ellipsoidal, with broadly rounded ends. After cell division, cells are arranged in a pair enclosed in the common cell wall. Soon the septum gets thickened by secretion of cell wall layers from both the protoplasts, so the mature protoplasts are widely separated by transverse septa. Cell walls of old cells often rupture at the median, giving rise to H-shaped pieces. Chloroplast parietal, usually band-shaped, covering 1/3 to 3/4 of the cell circumference, with one inconspicuous pyrenoid. Asexual reproduction by zoospores, aplanospores, and akinetes. Zoospores quadriflagellate, containing a plateshaped chloroplast with a pyrenoid and elongated anterior stigma. Akinetes are formed under unfavourable conditions, with thickened intermost and gelatinising outer cell wall.
Information contributed by: Skaloud et al. (2018: 102).. The most recent alteration to this page was made on 2018-03-15 by M.D. Guiry.
Taxonomic status: This name is of an entity that is currently accepted taxonomically.
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.
Comments: A genus of about five currently accepted species from freshwater habitats.
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Some of the descriptions included in AlgaeBase were originally from the unpublished Encyclopedia of Algal Genera, organised in the 1990s by Dr Bruce Parker on behalf of the Phycological Society of America (PSA) and intended to be published in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=43488
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 15 March 2018. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 10 December 2023