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| Wieffering, J.H.. |
| The differences between the most recent complete treatment of this genus by Clausen (1938) and the present revision are, I think, of a rather fundamental nature. For, though Dr Clausen and myself agree that in the troublesome taxa, ‘the small number of characters .... has forced workers .... to base conclusions concerning species often on trivial details such as leaf cutting and size, characters which would not ordinarily be considered of fundamental importance in other groups’ (l.c. p. 5), from there on we have followed a different train of thought. Clausen stated (l.c. p. 6) that ‘If these characters were not adopted as criteria for species, it would be necessary to reduce the species to a very small number and thereby remove the opportunity to keep... |
| Tipo: Article / Letter to the editor |
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| Ano: 1964 |
URL: http://www.repository.naturalis.nl/record/525584 |
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