Abstract
Data concerning the morphology of 100 species of Calothrix and Rivularia have been coded and stored on a computer file, and then used for a variety of comparisons using two different association coefficients. A table of nearest neighbours shows that the values for the association coefficients are sometimes so high that the use of one of the binomials seems superfluous. With the simple matching coefficient, SSM , ten pairs of nearest neighbours (including two pairs showing the reciprocal relationship) combine one species of Calothrix with one of Rivularia, rather than two species from the same genus. Three different types of data are compared with a master set of coded data: new taxa in a recent paper, named strains from culture collections and field populations of Rivularia collected by us. In each case only a minority of names indicated by conventional taxonomy correspond to the names indicated by comparison with the coded data.
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