(274–280) Proposals to amend the Code to harmonize botanical and zoological nomenclature used for the so‐called "ambiregnal" microorganisms (as exemplified by fossils).

When the International Fossil Plant Names Index (IFPNI; http://ifpni.org/) was established in 2014 as a global registry of scientific names of fossil organisms covered by the I International Code of Nomenclature for algae, fungi, and plants i ( I ICN i ; Turland & al. in Regnum Veg. 2017) illustrates the situation where a fossil-genus name now applied to a fossil charophycean alga was originally described as a fossil animal prior to the starting-point of palaeobotanical nomenclature (1820, the starting-point for fossil nomenclature in the I ICN i , Art. Numerous such names were treated as available under the I ICZN i without fully referenced basionyms or replaced synonyms, in contradiction to the requirement of I ICN i Art. If a taxon originally assigned to a group not covered by this I Code i is treated as belonging to the algae or fungi, any of its names need satisfy only the requirements of the relevant other I Code i that the author was using for status equivalent to valid publication under this I Code i (but see Art. [Extracted from the article]