| Name | Erysiphe mayorii var. japonica U. Braun & Y. Nomura |
| Authorship | U. Braun & Y. Nomura |
| Rank | Variety |
| Placed in | Erysiphe mayorii S. Blumer |
| Citation | 1984 Mycotaxon 20(2): 497 |
| Holdings | 1 Specimen held in the Harvard University Herbaria identified as Erysiphe mayorii var. japonica U. Braun & Y. Nomura |
| Identification made in | [no date] (1) |