Carbonea aggregantula is a species of lichenicolous (lichen-dwelling) fungus belonging to the family Lecanoraceae.
It is a lichenicolous fungus, meaning that it grows on other lichens, but it does not cause obvious symptoms of infection, unlike the similar Carbonea austroshetlandica.
Carbonea aggregantula is widely distributed. Although it has not been reported often, its distribution includes multiple continents. Carbonea aggregantula has been reported from some of the subantarctic islands, including King George Island, Penguin Island and Livingston Island.
Carbonea aggregantula has a wide range of host species which are still being discovered. Known hosts are: