Marchandiomyces corallinus is a lichenicolous fungus that parasitizes lichens, particularly those in the genera Physcia, Parmelia, Flavoparmelia, Lepraria, Pertusaria, Lasallia, and Lecanora. It is commonly found in eastern North America and Europe.
Despite most lichen parasites belonging to the phylum Ascomycota (95%), M. corallinus is in the phylum Basidiomycota.