Horsehair Lichen

In Great Britain and/or Ireland:
Lichen / symbiont
pycnidium of Lichenoconium coelomycetous anamorph of Lichenoconium usneae lives on/in dark brown to blackened apothecium of Bryoria fuscescens

Lichen / pathogen
apothecium of Phacopsis huuskonenii infects and damages extensively black and shiny geniculately deformed thallus of Bryoria fuscescens

Bryoria fuscescens is a species of lichen of the family Parmeliaceae.

As of July 2021, its conservation status has not been estimated by the IUCN. In Iceland, where it grows as an epiphyte on downy birch stems and branches, it is classified as a vulnerable species (VU).