„Article 4”. International Code of Nomenclature for algae, fungi, and plants. 2012. Arhivirano iz originala na datum 2018-08-03. Pristupljeno 2016-12-14. »4.1. If a greater number of ranks of taxa is desired, [...a]n organism may thus be assigned to taxa of the following ranks (in descending sequence): [... genus, ... species, subspecies,] variety (varietas), subvariety (subvarietas), form (forma), and subform (subforma). ... 4.3. Further ranks may also be intercalated or added, provided that confusion or error is not thereby introduced.«
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„Article 4”. International Code of Nomenclature for algae, fungi, and plants. 2012. Arhivirano iz originala na datum 2018-08-03. Pristupljeno 2016-12-14. »4.1. If a greater number of ranks of taxa is desired, [...a]n organism may thus be assigned to taxa of the following ranks (in descending sequence): [... genus, ... species, subspecies,] variety (varietas), subvariety (subvarietas), form (forma), and subform (subforma). ... 4.3. Further ranks may also be intercalated or added, provided that confusion or error is not thereby introduced.«