Placidium rufescens
- kingdom: Fungi
- phylum: Ascomycota
- class: Eurotiomycetes
- order: Verrucariales
- family: Verrucariaceae
- genus: Placidium
- species: Placidium rufescens
- Gumpoldskirchen
Lower Austria- Schröcken
Vorarlberg
Austria- Andora
- Laigueglia
Liguria
Italy- Sorengo
Ticino
Switzerland- Lincoln
Nebraska- Dallas
- Fort Davis
Texas
United States