"partial synonymy" undoubtedly record close natural relationship, but the names should not be regarded as invalid unless shown to be mutually inclusive. Lacking this, they remain applicable to fossils conspecific with their basic nomenclatural types. For the research worker there are advantages in this conservative view of synonymy, as it tends to promote a more precise differentiation of fossils. This basically, is a fundamental reason for the continued use of technical nomenclature, necessary to progress in the study of fossil plants.

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