Bryostigma huriellae

Bryostigma huriellae is a species of lichenicolous (lichen-dwelling) fungus of uncertain familial placement in the order Arthoniales. Found in South Korea, it was formally described as a new species in 2020 by lichenologists Sergey Kondratyuk and Jae-Seoun Hur. Bryostigma huriellae infects the thallus and apothecia of the crustose lichen Huriella pohangensis–it is this host that is referred to in the species epithet huriellae. The infection spots it forms on the host are highly inconspicuous, often only visible under 100x magnification or when examining sections of the host. These spots often display tiny, widely spaced ascomata or conidiomata. Over time, this fungus can be lethal to the host lichen. The ascomata of Bryostigma huriellae ranges from 70 to 100 μm in diameter and is 50 to 70 μm thick when sectioned. These structures are mostly embedded deep within the host's thallus or reproductive parts, and typically group in small clusters of 1 to 3. Their colour is predominantly black......read more on Wikipedia.