Nesolechia oxyspora

Nesolechia oxyspora is a species of lichenicolous (lichen-dwelling) fungus in the family Parmeliaceae that parasitizes various foliose and fruticose lichens worldwide. First described in 1852, it has undergone numerous taxonomic reclassifications, with ongoing debate about its proper generic placement. The fungus produces spindle-shaped spores and forms small, dark fruiting bodies that develop within the host lichen's tissue before breaking through the surface. Studies have revealed significant morphological variations depending on the host lichen species, suggesting it may represent a complex of closely related species adapted to specific hosts. This cosmopolitan species is known to parasitize at least 63 different lichen species across 19 genera, occasionally inducing gall formations on its hosts....read more on Wikipedia.