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It is a yellow-green branching lichen that grows on the bark of conifers (living and dead), and is toxic to mammals. It was historically used as a poison for wolves and foxes (thus the name).Wolf Lichen is highly resistant to freezing and low temperature and remains active in winter. It can resume photosynthesis a few minutes after thawing. It generally grows at heights on a tree that are above the snow line.
Yosemite NP, CA.