SUMMARYThe genusItersoniliais emended on the basis of variation in monocaryophase and dicaryophase cultures. Probable synonyms include two other genera of the Sporobolomycetaceae,TilletiopsisandSporidiobolus, and the proposed but invalid genusEntylomella(representing conidial states ofEntylomaand other smut fungi). The isolates ofItersoniliaresponsible for leafspot and canker of parsnip,Pastinaca sativaL., in the United States are considered to representI. perplexansDerx.