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Figure 6: Members of Nostocales . A colony of Gloeotrichia echinulata (A), Anabaena spiroides (B), Cylindrospermum sp. with
terminal heterocyst and sub-terminal akinete (C) and a portion of colony of Nostoc commune magnifi ed (D). Magnifi cation
of pictures (A), (B) x 200; (C) 10 µm and pictures (A) and (B) in Nomarski contrast. Pictures (A) and(B) courtesy P. Znachor,
Laboratory of Phytoplankton Ecology, Institute of Hydrobiology, Biology Centre ASCR, Na Sádkách , 37005 České Budějovice,
Czech Republic. www.FytoPlankton.cz. Picture (C) courtesy Ralf Wagner (Dusseldorf), Mark Schneegurt (Wichita State
University) and Cyanosite (www-cyanosite.bio.purdue.edu). Picture (D) courtesy Mark T. Aubel, GreenWater Laboratories/
CyanoLab, 205, Zeagler Drive, Suite 302, Palatka, Florida 32177, USA. (http://www.greenwaterlab.com/photo_algal.
htm).
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