Ramalina thrausta is a lichen that is native to California.
California Rare Plant Rank: 2B.1 (rare, threatened, or endangered in CA; common elsewhere).
[Wikipedia] Range: Ramalina thrausta is a species of fruticose lichen belonging to the family Ramalinaceae. It is found in Europe and Northern America. (link added by Mary Ann Machi)
[burkeherbarium.org] Description: Thallus grey-green and pendent, with slender branches 0.1-0.7 mm in width, flattened at base. Branches taper and curl at the tips. (link added by Mary Ann Machi)