In North America the most significant lichen dye is " Letharia vulpina ".
2.
In " Letharia Vulpina ", it is revealed Ken is supernaturally aware, and Noshiko is a kitsune.
3.
The Nogitsune's hold over him is temporarily broken when Deaton poisons Stiles with a shot of letharia vulpina.
4.
In " Letharia Vulpina ", Natalie is seen talking to Peter Hale at the school, to Lydia's distress.
5.
In " Letharia Vulpina ", Noshiko meets with Ken, where he hands her a fake book containing blades, unaware that Kira is spying on them.
6.
In " Letharia Vulpina ", Finstock walks into one of the Nogitsune's traps when he steps over a trip wire and is shot with an arrow.
7.
Isaac is induced into a coma in " Letharia Vulpina ", saving Allison from stepping into electrified water as one of the traps set by the Nogitsune possessing Stiles.
8.
In " Letharia Vulpina ", Parrish operated on a suspected bomb disguised as a birthday present left on the school bus, to determine if it is a bomb.
9.
Humans have also exploited this toxicity by using lichens that contain high amounts of the chemical ( such as " Letharia vulpina " ) as poison for wolves and foxes.
10.
The Klamath Indians in California soaked porcupine quills in a chartreuse-colored extract of " Letharia vulpina " that dyed them yellow; the quills were woven into the basket patterns.
