Scytonematopsis Kisseleva, 1930

Holotype species: Scytonematopsis woronichinii Kisseleva

Original publication and holotype designation: Kisseleva, E.I. (1931). About a new bluegreen algae Scytonematopsis woronichinii. Zhurnal Russkago Botanicheskago Obshchestva pri Akademii Nauk. 15: 169-174.

Description: Filamentous - thallose; solitary branched filaments, clusters with parallel or irregularly arranged filaments or mats on the substrate. Filaments free or densely coiled, creeping on the substrate, or joined to the substrate by middle parts and free ends of branches, sparsely or commonly falsely branched, usually with two (rarely with one) branches. Branching initiates after trichome dissociation by help of necridic cells, rarely after loop-formation, not at heterocytes. Trichomes isopolar, but sometimes (young trichomes) forming Homoeothrix-like heteropolar stages; ends of young trichomes and branches cylindrical with rounded terminal cells, but later always distinctly narrowed and sometimes with elongated, cylindrical, vacuolized apical and subapical cells; trichomes constricted or unconstricted at cross walls. Sheaths firm, limited, hyaline or (usually) parallel lamellated and telescopic, in majority of species yellowish-brown in old specimens. Cells shorter or longer than wide, variable in length, pale or olive-green, rarely pinkish or bright blue-green, towards the ends elongated and vacuolized, always without gas vesicles; numerous necridic cells. Heterocytes develop depending on the nitrogen concentration, intercalary, usually solitary, cylindrical or barrel-shaped, of different length. Akinetes described only rarely in rows (revision necessary). Cells divide crosswise to the trichome axis. Reproduction by hormogonia, which separate from the filament by way of necridic cells, escape from the sheath and germinate at both ends. Periphytic and metaphytic species, five species known from tropical regions (rice fields, littoral of lakes, springs, swamps), one species is marine, one described from thermal springs (USA), one from the rocky littoral of lakes and submersed stones of the alpine zone of Central European high mountains.

The most recent alteration to this page was made on 2021-03-30 by E.A. Molinari Novoa.

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.

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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.

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E.A. Molinari Novoa in Guiry, M.D. & Guiry, G.M. 30 March 2021. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway.; searched on 03 December 2022

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