What is pertaining to, derived from, or designating, an acid obtained from a lichen (Cetraria vulpina) as a yellow or red crystalline substance which on decomposition yields pulvinic acid called?

vulpic — Pertaining to, derived from, or designating, an acid obtained from a lichen (Cetraria vulpina) as a yellow or red crystalline substance which on decomposition yields pulvinic acid. (Webster's 1913.)

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