Oscillatoria Vaucher ex Gomont, 1892

Lectotype species: Oscillatoria princeps Vaucher ex Gomont

Original publication: Gomont, M. (1892 '1893'). Monographie des Oscillariées (Nostocacées Homocystées). Deuxième partie. - Lyngbyées. Annales des Sciences Naturelles, Botanique, Série 7 16: 91-264, pls 1-7.

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Type designated in: Gardner, N.L. (1932). The Myxophyceae of Porto Rico and the Virgin Islands. In: Scientific Survey of Porto Rico and the Virgin Islands. Volume VIII. Part 2. (Anon. Eds), pp. 249-311. New York: New York Academy of Sciences.

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Precise date of publication: 1 Jan 1892

Description: Trichomes blue- green to brownish-green, occasionally purple when old, highly motile, not or slightly constricted at the cross-walls, sometimes narrowing toward the often bent ends, central section of trichomes (19) 22-80 µm wide. Apical cells rounded and sometimes yellowish (together with several adjacent cells). Granulation never located at the cross-walls, but fine to large granules may be present in the cells. Cells much shorter than wide, new cell walls forming perpendicularly to the trichome axis, often before the previous division is finished. Cell wall colourless and thick, necridic cells present, sheath observed only in culture under stress conditions. No calyptra observed.

Information contributed by: Mühlsteinová et al. 2018. The most recent alteration to this page was made on 2023-03-03 by M.D. Guiry.

Taxonomic status: This name is of an entity that is currently accepted taxonomically.

Gender: This genus name is currently treated as feminine.

Most recent taxonomic treatment adopted: Strunecký, O., Ivanova, A.P. & Mares, J. (2022 '2023'). An updated classification of cyanobacterial orders and families based on phylogenomic and polyphasic analysis (Review). Journal of Phycology 59(1): 12-51.

Comments: Blue-green mats form on the bottom of lakes, ponds, and maybe rivers, later in the season they release and float at the water surface. The genus is probably distributed worldwide outside of cold regions. The whole genus seems to be well characterized by presence of large pores perforating its thick cell wall. These pores are conspicuous under both TEM and SEM and in some of the very large representatives with trichomes above 40 ?m, their presence can be detected also by the means of light microscopy; when focused on the very surface of the filament, the cell wall has an appearance that is slightly reminescent of a snakeskin. We were not always able to observe the “snakeskin effect” in the light microscope on all the representatives that we had available, but even for the thinner specimen the pores were clearly visible in the electron microscope. The phylogenetic position of the genus is based on the newly designated epitype CBFS A-89-1 originating from the strain O. princeps CCALA 1115. The phylogenetic placement of the genus Oscillatoria in the order Oscillatoriales and its rela- tionship to other cyanobacteria included in its close proximity is shown in Fig. 5. Whereas the phylogenetic support for the genus itself is steadily high across all the analy- ses that were performed, its relationship to other simple trichal genera remains unclear. Within the analysed data available (2018), the genus stands alone with no evident sister group.

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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=43083

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Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 03 March 2023. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 30 September 2023

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