| Name | Sphaerotheca castagnei f. xanthii-strumarii Saccardo | 
| Authorship | Saccardo | 
| Rank | Forma | 
| NomenclaturalStatus | NomLeg | 
| Placed in | Sphaerotheca castagnei Léveillé | 
| Citation | 1876 Mycoth. Veneta Cent. 10: no. 901 | 
| Holdings | 1 Specimen held in the Harvard University Herbaria identified as Sphaerotheca castagnei f. xanthii-strumarii Saccardo | 
| Identification made in | [no date] (1) |