Pseudanabaena Lauterborn, 1915
Holotype species: Pseudanabaena catenata Lauterborn
Original publication and holotype designation: Lauterborn, R. (1915). Die sapropelische Lebewelt. Ein Beitrag zur Biologie des Faulschlammes natürlicher Gewässer. Verhandlungen des Naturhistorisch-Medizinischen Vereins zu Heidelberg ser. 2 13: 395-481, pl. III.
Description: Filamentous; filaments (trichomes) solitary or agglomerated in very fine, mucilaginous mats, straight or slightly waved or arcuate, simple, usually not very long, without branching, 0.8-3 µm wide, composed of cylindrical cells, usually with slight constrictions at the distinct crosswalls; in young trichomes crosswalls thin and unclear, without firm sheaths, sometimes with fine, colorless, diffluent, narrow mucilaginous envelopes (staining); ends of trichomes not attenuated, but the apical cell is sometimes conical; indistinct and facultative motility (trembling). Cells cylindrical, always longer than wide, without aerotopes, but sometimes with solitary granules (subg. Pseudanabaena, Skujanema), or with gas vesicles agglomerated into aerotopes, localized in the ends of cells (in polar positions) (subg. Ilyonema), thylakoids localized parallel, peripherally; special pore patterns on the cell walls; end cell cylindrical and rounded at the end (subg. Pseudanabaena), or more or less conical to bluntly or sharply pointed (subg. Skujanema, Ilyonema). Cell division perpendicular to the longer trichome axis, cells grow into the original shape and size before the next division. Trichomes dissociate (in several species to solitary cells or few-celled segments) without necridic cells.
Information contributed by: J. Komárek. The most recent alteration to this page was made on 2016-09-11 by M.D. Guiry.
Taxonomic status: This name is of an entity that is currently accepted taxonomically.
Most recent taxonomic treatment adopted: Komárek, J., Kaštovský, J., Mares, J. & Johansen, J.R. (2014). Taxonomic classification of cyanoprokaryotes (cyanobacterial genera) 2014, using a polyphasic approach. Preslia 86: 295-335.
Comments: Several species are planktonic, tychoplanktonic or benthic in oligotrophic, mesotrophic to slightly eutrophic reservoirs, other species grow in soil or endogloeic in colonial planktonic rotifers or in mucilage of other algae. Few species are known from extreme biotopes (mineral and hot springs, saline or hypersaline localities)
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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=44060
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 11 September 2016. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 08 December 2023