Old man's beard lichen

1. In addition to Usnea, you can see some sort of crustose lichen on the bark.
2. Lichens are not an individual organism. They are a mutualism between a fungus and a photosynthetic microbe, either an alga or a photosynthetic bacterium. The genus-species names for lichens are assigned based on their fungal component. As such, I'm not sure whether it's better to put this in the fungus category or in the other category. Any guidance in this area is appreciated!