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- Spirogyra filaments are straight, uniseriate,
and unbranched. The cells are longer than broad and each contain
at least one and as many as sixteen spiraled, ribbon-shaped,
parietal chloroplasts with numerous round pyrenoids. The nucleus
is located in the center of the cell and is suspended from strands
of cytoplasm from the cell periphery.
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- The filaments sometimes have
basal rhizoidal growths to attach themselves to the substrate.
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