Note: Proposal to change Rule 18a, Rule 18f and Rule 30 to limit the retroactive consequences of changes accepted by the ICSB Tindall, B. J.,, 49, 1321-1322 (1999), doi = https://doi.org/10.1099/00207713-49-3-1321, publicationName = Microbiology Society, issn = 1466-5026, abstract= , language=, type=