Cylindrospermum siamense
Anabaena azollae - 1, an oblique longitudinal
section of a dorsal leaf lobe of the water fern
Azolla caroliniana; the large cavity
(C) containing filaments of A. azollae (A)
is conspicuous in the proximal half of the lamina;
2, habit of a trichome with 2 solitary heterocysts.
A. flos-aquae - 3, habit of trichome with akinetes (A),
heterocysts (H) and gas vacuoles (G).
A. siamensis - 4, 5, habits of trichomes
with terminal heterocysts and akinetes (arrows).
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2n =
Origin : area of origin
wild or cultivated
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