Summary: The annual radial growth rate of colonies measured was 1.25 ± 0.3 mm (mean ± 95% confidence limits), with maximal growth in early summer and minimal growth in winter. Two types of calcification were observed. In winter, the filaments were encrusted with small anhedral calcite crystals which occupied about 15% of the water-saturated volume of the colony. In summer, a dense (39-56 vol. %) subsurface layer of calcite was deposited, consisting of larger crystals enclosing filaments of , whilst the upper 60-100 μm was essentially free of encrustation. The streamwaters in which the was growing were permanently supersaturated with respect to calcite. The results are compared with the growth rates and mineralization processes found in other cyanobacteria.


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