Phacopsis

Phacopsis is a genus of lichenicolous fungi belonging to the family Parmeliaceae. These fungi are obligate parasites, meaning they can only survive and reproduce by living on and deriving nutrients from another organism, specifically lichens. Phacopsis species are found globally, often parasitizing crustose lichens. They typically manifest as small, often inconspicuous apothecia (fruiting bodies) on the surface of their host lichen. Identifying Phacopsis species often requires microscopic examination of their ascospores and other anatomical features. The genus is of interest to lichenologists and mycologists studying the intricate relationships and biodiversity within lichen communities. Phacopsis can contribute to the decline of their host lichens, impacting lichen community structure.