| Name | Cladonia chlorophaea f. costata (Flörke) Sandstede |
| Authorship | (Flörke) Sandstede |
| Rank | Forma |
| Placed in | Cladonia chlorophaea (Flörke ex Sommerfelt) Sprengel |
| Holdings | 57 Specimens held in the Harvard University Herbaria identified as Cladonia chlorophaea f. costata (Flörke) Sandstede |
| Identification made in | [no date] (57) |
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