| Name | Agaricus cerussatus var. difformis (Schumacher) Fries: Fries |
| Authorship | (Schumacher) Fries: Fries |
| Rank | Variety |
| Placed in | Agaricus cerussatus Fries: Fries |
| Citation | 1821 Syst. Mycol. 1: 93 |
| Holdings | 1 Specimen held in the Harvard University Herbaria identified as Agaricus cerussatus var. difformis (Schumacher) Fries: Fries |
| Identification made in | [no date] (1) |
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