When did the change of official name from Lactobacillus sanfrancisco to Lactobacillus sanfranciscensis happen? An answer ((to the exact day OR within a few days) AND the name of the conference at which it happened) would be appreciated.
That issue of Int J Syst Bacteriol was published 1 July 1997, so I guess that's your date.
Gänzle M G, M Ehmann, and W P Hammes. 1998. Modeling of growth of Lactobacillus sanfranciscensis and Candida milleri in response to process parameters of sourdough fermentation. Appl Environ Microbiol 64(7):2616–2623.
Trüper H G, De'Clari L. 1997. Taxonomic note: necessary correction of specific epithets formed as substantives (nouns) "in apposition." Int J Syst Bacteriol 47:908–909.