| Name | Microsphaera alni var. calocladophora (G. F. Atkinson) E. S. Salmon |
| Authorship | (G. F. Atkinson) E. S. Salmon |
| Rank | Variety |
| Placed in | Microsphaera alni (de Candolle) G. Winter |
| Citation | 1900 Mem. Torrey Bot. Club 9: 153 |
| Holdings | 2 Specimens held in the Harvard University Herbaria identified as Microsphaera alni var. calocladophora (G. F. Atkinson) E. S. Salmon |
| Identification made in | [no date] (2) |
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