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Photomicrographs of the Nostocales species studied. (a) Anabaena crassa; (b) Anabaena lemmermannii; (c) Anabaena mendotae; (d) Anabaena planctonica; (e) Aphanizomenon gracile; (f) Aphanizomenon ovalisporum; (g to i) akinetes of Aphanizomenon ovalisporum (g), Aphanizomenon gracile (h), and Cylindrospermopsis raciborskii (i); (j) Cylindrospermopsis raciborskii. Bars, 20 μm.
