Although the common name for the lichen Letharia vulpina is "wolf lichen", the Latin species name "vulpina" actually refers to foxes. E.g. the binominal (scientific) name for the common red fox is "Vulpes vulpes".
The red-headed girl who gets electrocuted in the hospital parking lot (after the paramedic) won the role in a "Die on Teen Wolf contest" the fall before.
The lichen Letharia vulpina exists, but it does not grow naturally on rock, as suggested in the show. The natural habitat of L. vulpina is the dry bark of conifer trees (pine, spruce etc).