A MEASURE of the extent to which an individual differs from the norm of a population, taking many attributes into account, would often be useful in numerical taxonomy. With metrical attributes, the ...

The use of numerical and statistical methods to classify and discriminate between species and other groups of animals, plants and microorganisms is largely a development of the last 20 or so years. Of ...

IN the Fungi Imperfecti, the system of classification which has evolved over the past 150 years involves the recognition of ‘form species’ and ‘form genera’ which lack any established genetic basis.