Arthrospira (Spirulina) species show great plasticity in morphology. This is attributed to environmental factors like temperature and other physical and chemical factors and possibly also due to genetic change. In nature and in culture, Arthrospira forms helical trichomes of varying size and degree of coiling from tightly coiled morphology to an even straight uncoiled form. The trichomes in Arthrospira species show distinct transverse cross-walls under the light microscope. The filaments are solitary and reproduce by binary fission. The cells of the trichomes are broader than long and the width can vary from 3 to 12 ^m though it can reach 16 ^m occasionally. The cell organization is that of a typical prokaryote with a lack of membrane-bound organelles.4
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