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