Abstract
The comparative study of two species of freshwater Rivularia which form calcareous deposition, Rivularia biasolettiana Menegh and Rivularia haematites (D.C.) Agardh, allows to purpose a schema explaining the periodical deposition of lightsparitic layers and dark micritic ones. If we consider the filament, the micritic crystallization would settle in the part of the trichome which is embedded in a mucilaginous sheath, and the sparitic crystallization around the characteristic hair of Rivulariaceae. Considering the colony, the filaments, in Rivularia haematites, being all on the same level, and their growing equally would determine well delimited dark and light zones.
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