|INTERNATIONAL CODE OF BOTANICAL NOMENCLATURE online|
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1.1. Taxonomic groups of any rank will, in this Code, be referred to as taxa (singular: taxon).
1.2. Fossil taxa (diatoms excepted) may be treated as morphotaxa. A morphotaxon is defined as a fossil taxon which, for nomenclatural purposes, comprises only the one part, life-history stage, or preservational state represented by the corresponding nomenclatural type.
1.3. As in the case of form-taxa for asexual forms (anamorphs) of certain pleomorphic fungi (Art. 59), the provisions of this Code authorize the publication and use of names of morphotaxa (Art. 11.7).
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