Tremella cetrariellae

Tremella cetrariellae is a lichenicolous fungus (a fungus that lives on lichens) in the family Tremellaceae. It is a parasitic fungus that grows exclusively on a ground-dwelling Arctic and alpine lichen called Cetrariella delisei, creating small brown or blackish swellings on the lichen's surface. The fungus was formally described in 2015 when researchers used DNA analysis to distinguish it from a closely related species, revealing that what had previously been treated as a single taxon actually comprised two distinct but morphologically similar species. Its distribution is restricted to high-latitude regions of the Arctic and subarctic, including Greenland, Scandinavia, and northern Russia....read more on Wikipedia.