Threatened by coastal development, alteration of fire regimes, and over-collecting. Portions of populations have been extirpated due to historical residential development. See Bulletin of the California Lichen Society 14(2):45-47 (2007) for CALS Conservation Committee sponsorship.
California Native Plant Society, Rare Plant Program.
Inventory of Rare and Endangered Plants of California (online edition, v8-03), with lichen data from the California Lichen Society.
Website http://www.rareplants.cnps.org [accessed ].