Placidium tuckermanii
- kingdom: Fungi
- phylum: Ascomycota
- class: Eurotiomycetes
- order: Verrucariales
- family: Verrucariaceae
- genus: Placidium
- species: Placidium tuckermanii
- Shenandoah
Louisiana- Chillum
- Langley Park
- Takoma Park
Maryland- Thorndale
Pennsylvania- Houston
Texas- Keyser
West Virginia
United States