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MarBEF Data System |
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HABs 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]
 Present Inaccurate Introduced: alien Containing type locality
From regional or thematic species database
Description Trichomes free-floating in freshwater plankton, solitary, straight or slightly flexuous, clearly constricted at the cross-walls, not or slightly attenuated towards ends, without mucilaginous envelopes or with very fine mucilage around trichomes. Cells barrel-shaped or ± spherical, often longer than wide, slightly citriform, sometimes slightly variable in width in one and the same trichome, blue-green with scattered aerotopes in cells, 5-10 (16?) x 5-6.5 (8-10?) μm; end cells oval, rounded. Hetero¬cytes spherical to slightly ellipsoid or oval, solitary, intercalary, 6-10 (16?) μm in diameter. Akinetes intercalary, solitary or less frequently two together, ellipsoidal, when mature slightly hexagonal-rounded or almost ovoid in outline, greatest width 1/3 of length, at the ends slightly and widely conical, distant from heterocytes (by 1-10 cells), 17-35 x 11-21 μm. [details]
Identification Characteristic in the form of cells and akinetes, but even in akinetes there exists variation in size and outline. Anabaena macrospora var. crassa Klebahn 1885 is recorded from Japan and from central Asia, var. gracilis sensu Guarrera & Echenique (1989) from Argentina (Tierra del Fuego), which belongs, however, probably to another species. [details]
Remark Heterocysts, nitrogen fixing filamentous form [details]
From editor or global species database
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