Wolf lichen is my new favourite lichen. The Klamath Indians in California soaked porcupine quills in a chartreuse extract of Letharia vulpina to dye them yellow; then wove the quills into their basket patterns. The pigment is actually vulpinic acid, which is relatively toxic to meat-eating mammals as well as insects and molluscs (but not toxic to rabbits and mice). It’s been used historically as a poison for wolves and foxes.

Just one of the many new-to-me wonders in the Sierra Nevada.