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

Coccotrema maritimum Brodo

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Scientific name
Coccotrema maritimum
Common names
IUCN Specialist Group
Assessment status
Proposed by
Jessica Allen
Jessica Allen
Comments etc.
Anders Dahlberg, Toby Spribille

Assessment Notes

Taxonomic notes

Why suggested for a Global Red List Assessment?

Coccotrema maritimum has a very narrow geographic distribution and is restricted ecologically to growing almost exclusively on maritime rocks within the salt-spray zone. The geographic and ecological range of this species makes it sensitive to environmental change.

Geographic range

The range of this species is narrowly restricted to the Queen Charlotte Islands, southeastern Alaska, and one known population from the Aleutian Islands.

Population and Trends

No research has been done to document the number and size of C. maritumum populations.

Population Trend: Uncertain

Habitat and Ecology

This species only occurs on rocks in maritime regions. It grows at or just above the spray of saltwater (Brodo 1973).

Rocky Shoreline


The rarity and very narrow distribution of this species makes it susceptible to extinction due to stochastic events. This threat of extinction is exacerbated by climate change and air pollution.

Oil & gas drillingPollutionClimate change & severe weather

Conservation Actions

Ensuring that populations of this species are not affected by any human recreation or resource extraction activity is essential. Additionally, it should be listed in the United States as an endangered species and in Canada it should be protected by COSEWIC. 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).

Site/area protectionResource & habitat protectionSite/area managementEducation & awarenessFormal educationTrainingAwareness & communicationsLaw & policyLegislationNational level

Research needed

Research on the population size and genetics would greatly enhance our understanding of this species. Additionally, long-term monitoring projects need to be conducted.

Population size, distribution & trendsLife history & ecologySpecies Action/Recovery PlanArea-based Management PlanPopulation trends

Use and Trade


Brodo, I. M. 1973. The lichen genus Coccotrema in North America. The Bryologist 76: 260-270.

Country occurrence

Regional Population and Trends

Country Trend Redlisted