Muellerella pygmaea
- kingdom: Fungi
- phylum: Ascomycota
- class: Eurotiomycetes
- order: Verrucariales
- family: Verrucariaceae
- genus: Muellerella
- species: Muellerella pygmaea
- Großkirchheim
- Sittersdorf
Carinthia- Thurn
Tyrol- Gallneukirchen
- Zwettl an der Rodl
Upper Austria- Schruns
Vorarlberg
Austria- Neureichenau
Bavaria- Haiger
Hesse
Germany- Ludvika
Dalarna
Sweden- Idyllwild
- Idyllwild-Pine Cove
California- Camden
Maine
United States