Muellerella erratica

{{Short description|Species of fungus}}

{{Speciesbox

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| taxon = Muellerella erratica

| authority = (A.Massal.) Hafellner & V.John (2006)

| synonyms = *Tichothecium erraticum {{small|A.Massal. (1855)}}

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Muellerella erratica is a species of lichenicolous fungus in the family Verrucariaceae.{{GBIF |id=5490662|taxon=Muellerella erratica |accessdate=18 September 2022}} It has been reported from numerous countries, including India. Known host species include the thallus of Lecidea lapicida and Lecanora.