CaRMS taxon details
basis of record
Guiry, M.D. & Guiry, G.M. (2023). AlgaeBase. <em>World-wide electronic publication, National University of Ireland, Galway.</em> searched on YYYY-MM-DD., available online at http://www.algaebase.org [details]
From editor or global species database
Harmful effect Strains of this species have been found to produce PST (Pereira et al. 2004, Ballot et al. 2010, Casero et al. 2014, Yilmaz et al. 2018) and cylindrospermopsin (Kokociński et al. 2013) [details]
LSID urn:lsid:algaebase.org:taxname:54696 [details]From regional or thematic species database
Description Trichomes free-floating, solitary, isopolar, subsymmetric, straight or slightly arcuate or coiled, ± cylindrical, slightly but distinctly constricted at the cross-walls, slightly and continually narrowed towards ends. Cells cylindrical to slightly barrel-shaped, ± isodiametrical or a little longer than wide, (2) 2.8-6.4 (8) x (2) 2.6-3.1 (4) μm in the central part, with slightly granulated, blue-green content and usually irregularly located aerotopes; terminal cells slightly elongated and narrowed, (3.6) 4.3-6.4 (12) x 1.5-2.1 (2.8) μm, apical cells rounded and often slightly capitate at the ends. Heterocytes intercalary, solitary, usually only 1-2 per trichome, 3.5-7.8 (9.8) x (2.5) 3-4.9 (5.9) μm. Akinetes ± short-cylindrical with rounded ends, from heterocytes separated usually by 1-4 (7) vegetative cells, solitary, rarely in pairs or (excep¬tionally) up to 4 in a row, in a subsymmetric position in a trichome, (6.4) 7.8-14.7 (16.7-30) x (2.9) 3.9-5.9 (8) μm; at poles of akinetes appear often cup-shaped sheath formations opened towards the neighbouring vegetative cells (= typical feature for this species). — Interesting species, representing possibly a special generic unit. [details]
Distribution Planktic, locally common species sometimes forming water blooms, occurring in eutrophic, usually not very large reservoirs (ponds, lakes); in the whole temperate zone. Populations from S America (see, e. g., in Werner 1988 from Brazil) differ from European specimens morphologically (morphology of terminal cells, akinetes, etc.) and probably belong to different genotype. [details]
Remark Heterocysts, nitrogen fixing filamentous form [details]
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