Melarthonis

Melarthonis is fungal genus in the family Chrysotrichaceae. It is a monotypic genus, containing the single species Melarthonis piceae, a rare corticolous lichen. This lichen forms a very thin, almost invisible layer of tiny pale-green granules on tree bark, along with small black reproductive structures. It is known only from a single location in Hokkaido, Japan, where it was discovered growing on spruce trees in an old-growth forest.