Muellerella pygmaea is a species of lichenicolous fungus in the family Verrucariaceae. It has a cosmopolitan distribution in Arctic-alpine areas and grows on the thallus and apothecia of a number of hosts.
Host species for Muellerella pygmaea include:
Acarospora sp. Acarospora smaragdula Aspicilia calcarea Candelariella aurella Carbonea assentiens Lecanora alpigena Lecanora muralis Lecanora polytropa Lecidea grisella Lecidea lapicida Lecidea obluridata Tephromela atra Rhizocarpon geographicum Rhizocarpon superficiale Rusavskia elegans
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