G. C. Ainsworth clarifies that nomenclature serves classification rather than determining it. Using the thrush fungus as a concrete example, he explains how scientific naming works under international nomenclatural codes. The thrush fungus, first named Oidium albicans in 1853, has accumulated over 90 synonyms and been classified in at least ten genera. The correct scientific name is determined by the first legitimate, validly published name of a given taxonomic rank. However, selecting this name requires prior taxonomic decisions about proper genus classification. The organism's original genus Oidium applies to powdery mildews, not yeasts, and Monilia refers to brown rot fungi. Since 1923, mycologists classified it in genus Candida, though technical issues with Candida's nomenclatural type existed. An earlier overlooked name, Syringospora (1868), technically took precedence, but conservation procedures at the 1954 International Botanical Congress preserved Candida albicans as the accepted name. Ainsworth emphasizes that sound taxonomy is fundamental to avoiding nomenclatural confusion, and that nomenclatural codes are flexible frameworks reflecting current practice rather than rigid rules.

Key findings

• Nomenclature regulates names after taxonomic classification decisions are made; it does not determine classification itself
• The correct scientific name of a taxon is the first legitimate name validly published with the same rank, requiring prior taxonomic decisions about proper genus placement
• The thrush fungus exemplifies nomenclatural complexity, with over 90 synonyms accumulated through multiple genus classifications (Oidium, Monilia, Syringospora, Candida)
• International nomenclatural codes are non-penal frameworks that evolve with taxonomic practice and current usage
• Good taxonomy is essential for avoiding nomenclatural confusion; morphology-based codes require supplementation by physiological, biochemical, and serological characters for microorganisms