Since Feldmann index is based on the ratio of the overall numbers of two groups of algae quite sensitive to environmental changes, it has to be regarded as an extremely good index for the biogeographical assessment of marine benthic macroflora in any given geographical region. In addition, Cheney's index that takes into account also green algae has to be considered a good phytogeographical index. However, both indexes can hardly be employed for the assessment of floras from geographical areas subject to conditions of environmental instability.

R/P index employment has been advocated, on much smaller space scales, for the assessment of the conditions of particular phytobenthic communities and/or of the ecological conditions of small coastal areas. However, its application for such purposes requires further investigations and, notably, more accurate evaluation of reference values should be made.

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