• 1Proposed
  • 2Under Assessment
  • 3Preliminary Assessed
  • 4Assessed
  • 5Published

Lecanora simeonensis K. Knudsen & Lendemer

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Scientific name
Lecanora simeonensis
K. Knudsen & Lendemer
Common names
IUCN Specialist Group
Assessment status
Proposed by
James Lendemer
James Lendemer
Comments etc.
Anders Dahlberg

Assessment Notes

Taxonomic notes

Why suggested for a Global Red List Assessment?

Lecanora simeonensis is a rare species that is endemic coastal areas of southern California where it is threatened by multiple forces.

Geographic range

Lecanora simeonensis is narrowly endemic to coastal southern and central California in eastern North America.

Population and Trends

Demographic studies are needed to assess and monitor populations sizes. Populations are currently presumed to be stable, although extant populations may represent remnants of a once larger range in the region.

Population Trend: Stable

Habitat and Ecology

Lecanora simeonensis is restricted to old wood and lignum in coastal habitats.


Historical activities including large scale conversion of natural habitats, intensive grazing, and recreation have led to habitat degradation throughout the region where this species occurs. Current threats include further conversion of natural habitats, habitat shifts/alteration due to climate change, air pollution, road/utility construction and maintenance, recreation and increased frequency/intensity of wildfires that have.

Residential & commercial developmentHousing & urban areasCommercial & industrial areasTourism & recreation areasTransportation & service corridorsRoads & railroadsUtility & service linesNatural system modificationsFire & fire suppressionPollutionDomestic & urban waste waterIndustrial & military effluentsAgricultural & forestry effluentsAir-borne pollutantsSmogClimate change & severe weatherHabitat shifting & alterationDroughtsTemperature extremesStorms & flooding

Conservation Actions

Conservation actions that can be taken including educating and training land managers and local botanists to identify the species so we can monitor its health as well as contracting experts to conduct detailed monitoring at various time intervals (every 5 to 10 years), federally listing the species as endangered in the United States. Further conservation of lands where existing populations occur, and intensive searches of inaccessible coastal areas, are also needed.

Land/water protectionSite/area protectionResource & habitat protectionLand/water managementSite/area managementHabitat & natural process restorationSpecies recoveryEducation & awarenessFormal educationTrainingAwareness & communicationsLaw & policyLegislationNational level

Research needed

Further research that will aid in the conservation of this species includes intensive searches for additional extant populations, population assessments and monitoring, population genetics studies, and ecological studies that incorporate threats to the species. Additionally, a species recovery plan needs to be written.

ResearchPopulation size, distribution & trendsLife history & ecologyThreatsActionsConservation PlanningSpecies Action/Recovery PlanArea-based Management PlanMonitoringPopulation trendsHabitat trends

Use and Trade


J. C. Lendemer and K. Knudsen 2009: Two new usnic acid containing species of Lecanora from western North America. - Opuscula Philolichenum 6: 73-80.

Country occurrence

Regional Population and Trends

Country Trend Redlisted