| Name | Cladonia sylvatica f. spumosa (Flörke) Kusan |
| Authorship | (Flörke) Kusan |
| Rank | Forma |
| Placed in | Cladonia sylvatica (Linnaeus) Hoffmann |
| Holdings | 2 Specimens held in the Harvard University Herbaria identified as Cladonia sylvatica f. spumosa (Flörke) Kusan |
| Identification made in | [no date] (2) |
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