There are very few known populations of Sulcaria badia and negative impacts to the species from increasing residential and agricultural development have been documented. Additionally, two populations have already been reported as extirpated.
This species is endemic to the west coast of the United States and is found from Washington to northern California.
This species was originally known from Washington, Oregon and California. However, the Washington population has not been successfully relocated (Peterson et al. 1998) and further searching did not result in any newly discovered populations in that area (Carlberg 2006).
Population Trend: Decreasing
This species grows predominantly on Gary oak and cherry trees (Brodo and Hawksworrth 1977), but has also been found on many other tree species (Carlberg 2006).
This species is most threatened by habitat loss due to increasing agricultural and residential areas as well as the increased air pollution (Peterson et al. 1998).
Ensuring that populations of this species are not affected by any increasing human residential and agricultural development is essential. Additionally, it should be listed in the United States as an endangered species. Additionally, education and training of land managers and local botanists to identify the species should be conducted, and contracted experts should be hired to conduct detailed monitoring at various time intervals (every 5 to 10 years).
Research on the population size and genetics would greatly enhance our understanding of this species. Additionally, long-term monitoring projects need to be conducted.
Carlberg, T. 2006: Sulcaria badia, sponsorship for the CALS Conservation Committee. - Bulletin of the California Lichen Society 13(2): 45-50.
Brodo, IM/ Hawksworth, DL 1977: Alectoria and allied genera in North America. - Opera Bot. 42: 1-164.
Peterson, EB/ Greene, DM/ McCune, B/ Peterson, ET/ Hutten, MA/ Weisberg, P/ Rosentreter, R 1998: Sulcaria badia, a rare lichen in western North America. - The Bryologist 101(1): 112-115.