Placidium lachneum
- kingdom: Fungi
- phylum: Ascomycota
- class: Eurotiomycetes
- order: Verrucariales
- family: Verrucariaceae
- genus: Placidium
- species: Placidium lachneum
- Visby
Gotland
Sweden- Alderney
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Arizona- Calico Rock
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Texas
United States