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Summary: The annual radial growth rate of Homoeothrix crustacea colonies measured in situ 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 Homoeothrix, whilst the upper 60-100 μm was essentially free of encrustation. The streamwaters in which the Homoeothrix was growing were permanently supersaturated with respect to calcite. The results are compared with the growth rates and mineralization processes found in other cyanobacteria.

Growth and Calcification of the Cyanobacterium Homoeothrix crustacea